I tough some of you might be interested in this event: 6h winter bike race on March 12 2011, from 18h00 to midnight. The event will be at Montmorency forest, which is in the Quebec city area.
Registration fees are 60$ solo, 100$ team of 2 and 160$ for a team of 4. (There used to be a mandatory fund raising, but it's no longer required.)
All the details at : http://www.36hforet.com/velo-montagne-nuit.html
I know, all the web site is in French... Let me know if I can help with the translation.
And by the way, the Montmorency forest also has a pretty good network of cross-country ski trails.