Bicycle Transportation Alliance, for those in the Pac NW.
And my favorite, though not necessarily an advocacy site, it might get people to fall in love with the bicycle:
Bike Reader
__________________
Cat 2 Track, Cat 3 Road.
"If you’re new enough [to racing] that you would ask such question, then i would hazard a guess that if you just made up a workout that sounded hard to do, and did it, you’d probably get faster." --
the tiniest sprinter