Greatest of them all : Bikeradar.com.  This site has quality reviews (tons of them actually) and all the news you could possibly want about the sport.  It’s mainly geared towards road and mountain biking and less to urban but it’s still the big daddy as far as bike sites go.  Most of their reviews are online republishing of magazine content which then becomes freely and permanently available (which is great…and green).  If you’re interested in cycling, you have to bookmark this one !