I won't bother to push my own page, which is an insignificant little vanity project and hasn't been updated since dirt was clean.
I will however give a plug to
petefagerlin.com, a nice mountain biking page with some sweet video for those with high speed lines. The
Tour de France website is well done. And of course, we must not forget
Park Tool's site for all of its helpful repair advice.
Edit: I have to add
Mike Bentley's great site. Lot's of links with a midwestern bent.