Keeping your elbows out also helps to keep your front wheel straight. If your front wheel is straight when you land, even if the rear wheel got tweaked out a bit in the air, you can still roll out a landing 99% of the time.
Stay loose, so that if you do get a little wild in the air, or your landing zone is populated with obstactles, you can flow with the bike when it hits something oddly shaped or placed.
When you're launching off of a fairly horizontal ledge, keep your speed up & shift your weight back slightly just before leaving the ground. This helps keep your bike level through the air, as well as slightly dropping the rear wheel just before touch-down.
Having your rebound correctly set up is also very important..... Otherwise, you could get bounced off of your bike on a fairly hard landing.
As stated before, looking ahead 20-30 ft while riding helps incredibly with your ability to take drops, jumps, & other obstacles. Don't ignore them, just register that they're there, and let the bike worry about the rest. Especially with +6" of travel, modern bikes are capable of sucking up some pretty serious terrain, as long as the rider helps out a little.
Lose the death-grip on the brakes, especially just before an obstacle.... Unless you KNOW that you need to check your speed to keep from overshooting a landing or trail-bend. If you see something freaky coming up, 20-30ft ahead, slow down then, and roll it out.