As suggested, here is what I compiled quickly, so that others that need trail info can know where to look and who to ask. Please feel free to add other trail systems that I have forgotten. Additionally, I can add trail info to this post if requested. Please note that some of the "conditions" threads don't exist or don't really mention conditions at first, but hopefully they will be updated as needed.
There is no need to post actual trail conditions or reviews in this thread, as it will become much too cumbersome to use. I will see about getting this thread stickied.
Philadelphia:
Wissahickon
conditions: http://forums.mtbr.com/showthread.php?t=501958
reviews: http://trails.mtbr.com/cat/united-states-trails/trails-pennsylvania/trail/PRD_170152_4573crx.aspx
Real-Time trail conditions: http://www.phillymtb.com.
Pennypack
conditions: http://forums.mtbr.com/showthread.php?t=536548
reviews: http://trails.mtbr.com/cat/united-states-trails/trails-pennsylvania/trail/PRD_170058_4573crx.aspx
Belmont Plateau
conditions:
reviews: http://trails.mtbr.com/cat/united-states-trails/trails-pennsylvania/trail/PRD_169916_4573crx.aspx
Don Guanella
conditions:
reviews: http://trails.mtbr.com/cat/united-states-trails/trails-pennsylvania/trail/PRD_169954_4573crx.aspx
Swarthmore/Smedley
conditions:
reviews: http://trails.mtbr.com/cat/united-states-trails/trails-pennsylvania/trail/PRD_303472_4573crx.aspx
Downingtown:
Gibson Covered Bridge/Harmony Hill/D'Town
conditions: http://forums.mtbr.com/showthread.php?t=425014
reviews: http://trails.mtbr.com/cat/united-states-trails/trails-pennsylvania/trail/PRD_169976_4573crx.aspx
Marsh Creek State Park
conditions: http://forums.mtbr.com/showthread.php?t=548841
reviews: http://trails.mtbr.com/cat/united-states-trails/trails-pennsylvania/trail/PRD_170029_4573crx.aspx
Reading Area:
French Creek State Park
conditions: http://forums.mtbr.com/showthread.php?t=583939
reviews: http://trails.mtbr.com/cat/united-states-trails/trails-pennsylvania/trail/PRD_169971_4573crx.aspx
Blue Marsh
conditions: http://forums.mtbr.com/showthread.php?t=549145
reviews: http://trails.mtbr.com/cat/united-states-trails/trails-pennsylvania/trail/PRD_169922_4573crx.aspx
Antietam/Mt. Penn/Pagoda
conditions: http://forums.mtbr.com/showthread.php?t=510366
reviews: http://trails.mtbr.com/cat/united-states-trails/trails-pennsylvania/trail/PRD_437947_4573crx.aspx
Valley Forge / King of Prussia:
Betzwood? - can anybody comment on the legality
Lehigh Valley (and surrounding areas):
VMB Trail finder for Lehigh Valley Area trails: http://bikevmb.com/trailfinder
Trail News and conditions reports: http://bikevmb.com/forum/6
(Thanks dankilling)
Bear Creek Ski Resort
conditions: http://forums.mtbr.com/showthread.php?t=506911
reviews: http://trails.mtbr.com/cat/united-states-trails/trails-pennsylvania/trail/PRD_169911_4573crx.aspx
(note: location shown in trail review is currently incorrect)
Salisbury
conditions: http://forums.mtbr.com/showthread.php?t=491945
reviews: http://trails.mtbr.com/cat/united-states-trails/trails-pennsylvania/trail/PRD_331075_4573crx.aspx
South Mountain (Lehigh)
Politically Incorrect to post about
Blue Mountain (Gravity Riding)
http://www.verticalearthpa.com/
http://www.skibluemt.com/
Lancaster/Lebanon Counties
Individual trails to be added soon, until then, visit:
www.sambabiker.com
York Area:
Rocky Ridge County Park
Conditions: http://www.yamba.org
Reviews: http://trails.mtbr.com/cat/united-states-trails/trails-pennsylvania/trail/PRD_170085_4573crx.aspx
Lake Redman
Conditions: http://www.yamba.org
Reviews: http://trails.mtbr.com/cat/united-states-trails/trails-pennsylvania/trail/PRD_170011_4573crx.aspx
Spring Valley
Conditions: http://www.yamba.org
Reviews: http://trails.mtbr.com/cat/united-states-trails/trails-pennsylvania/trail/PRD_170104_4573crx.aspx
Delaware
White Clay Creek
conditions: http://www.rideonenine.com/
reviews: http://trails.mtbr.com/cat/united-states-trails/trails-delaware/trail/PRD_166920_4535crx.aspx
Middle Run
conditions: http://www.rideonenine.com/
reviews: http://trails.mtbr.com/cat/united-states-trails/trails-delaware/trail/PRD_166916_4535crx.aspx
Brandywine State Park:
conditions: http://www.rideonenine.com/
reviews:http://trails.mtbr.com/cat/united-states-trails/trails-delaware/trail/PRD_166909_4535crx.aspx
Maryland
Fair Hill County Park
conditions: http://www.rideonenine.com/
reviews: http://trails.mtbr.com/cat/united-states-trails/trails-maryland/trail/PRD_168231_4553crx.aspx
*Disclaimer* I realize there are probably a ton of smaller trail systems that I have left out. Don't worry, I will add them at your request!
There is no need to post actual trail conditions or reviews in this thread, as it will become much too cumbersome to use. I will see about getting this thread stickied.
Philadelphia:
Wissahickon
conditions: http://forums.mtbr.com/showthread.php?t=501958
reviews: http://trails.mtbr.com/cat/united-states-trails/trails-pennsylvania/trail/PRD_170152_4573crx.aspx
Real-Time trail conditions: http://www.phillymtb.com.
Pennypack
conditions: http://forums.mtbr.com/showthread.php?t=536548
reviews: http://trails.mtbr.com/cat/united-states-trails/trails-pennsylvania/trail/PRD_170058_4573crx.aspx
Belmont Plateau
conditions:
reviews: http://trails.mtbr.com/cat/united-states-trails/trails-pennsylvania/trail/PRD_169916_4573crx.aspx
Don Guanella
conditions:
reviews: http://trails.mtbr.com/cat/united-states-trails/trails-pennsylvania/trail/PRD_169954_4573crx.aspx
Swarthmore/Smedley
conditions:
reviews: http://trails.mtbr.com/cat/united-states-trails/trails-pennsylvania/trail/PRD_303472_4573crx.aspx
Downingtown:
Gibson Covered Bridge/Harmony Hill/D'Town
conditions: http://forums.mtbr.com/showthread.php?t=425014
reviews: http://trails.mtbr.com/cat/united-states-trails/trails-pennsylvania/trail/PRD_169976_4573crx.aspx
Marsh Creek State Park
conditions: http://forums.mtbr.com/showthread.php?t=548841
reviews: http://trails.mtbr.com/cat/united-states-trails/trails-pennsylvania/trail/PRD_170029_4573crx.aspx
Reading Area:
French Creek State Park
conditions: http://forums.mtbr.com/showthread.php?t=583939
reviews: http://trails.mtbr.com/cat/united-states-trails/trails-pennsylvania/trail/PRD_169971_4573crx.aspx
Blue Marsh
conditions: http://forums.mtbr.com/showthread.php?t=549145
reviews: http://trails.mtbr.com/cat/united-states-trails/trails-pennsylvania/trail/PRD_169922_4573crx.aspx
Antietam/Mt. Penn/Pagoda
conditions: http://forums.mtbr.com/showthread.php?t=510366
reviews: http://trails.mtbr.com/cat/united-states-trails/trails-pennsylvania/trail/PRD_437947_4573crx.aspx
Valley Forge / King of Prussia:
Betzwood? - can anybody comment on the legality
Lehigh Valley (and surrounding areas):
VMB Trail finder for Lehigh Valley Area trails: http://bikevmb.com/trailfinder
Trail News and conditions reports: http://bikevmb.com/forum/6
(Thanks dankilling)
Bear Creek Ski Resort
conditions: http://forums.mtbr.com/showthread.php?t=506911
reviews: http://trails.mtbr.com/cat/united-states-trails/trails-pennsylvania/trail/PRD_169911_4573crx.aspx
(note: location shown in trail review is currently incorrect)
Salisbury
conditions: http://forums.mtbr.com/showthread.php?t=491945
reviews: http://trails.mtbr.com/cat/united-states-trails/trails-pennsylvania/trail/PRD_331075_4573crx.aspx
South Mountain (Lehigh)
Politically Incorrect to post about
Blue Mountain (Gravity Riding)
http://www.verticalearthpa.com/
http://www.skibluemt.com/
Lancaster/Lebanon Counties
Individual trails to be added soon, until then, visit:
www.sambabiker.com
York Area:
Rocky Ridge County Park
Conditions: http://www.yamba.org
Reviews: http://trails.mtbr.com/cat/united-states-trails/trails-pennsylvania/trail/PRD_170085_4573crx.aspx
Lake Redman
Conditions: http://www.yamba.org
Reviews: http://trails.mtbr.com/cat/united-states-trails/trails-pennsylvania/trail/PRD_170011_4573crx.aspx
Spring Valley
Conditions: http://www.yamba.org
Reviews: http://trails.mtbr.com/cat/united-states-trails/trails-pennsylvania/trail/PRD_170104_4573crx.aspx
Delaware
White Clay Creek
conditions: http://www.rideonenine.com/
reviews: http://trails.mtbr.com/cat/united-states-trails/trails-delaware/trail/PRD_166920_4535crx.aspx
Middle Run
conditions: http://www.rideonenine.com/
reviews: http://trails.mtbr.com/cat/united-states-trails/trails-delaware/trail/PRD_166916_4535crx.aspx
Brandywine State Park:
conditions: http://www.rideonenine.com/
reviews:http://trails.mtbr.com/cat/united-states-trails/trails-delaware/trail/PRD_166909_4535crx.aspx
Maryland
Fair Hill County Park
conditions: http://www.rideonenine.com/
reviews: http://trails.mtbr.com/cat/united-states-trails/trails-maryland/trail/PRD_168231_4553crx.aspx
*Disclaimer* I realize there are probably a ton of smaller trail systems that I have left out. Don't worry, I will add them at your request!