Tour De France (This official site details each of the 20 stages and has a FAQ. You can also buy a Yellow Jersey!)
Cyber Cyclist (Webs Foremost Cycling Ezine)
Cycling UK (Cycles and Cycling in the UK)
No Fear, face your dreams, live your fears. Covers motorsports, boardsports, BMX and motocross. Theres a shop but its US only, however there's a great selection of links
E-Wire, Biking and Music together in perfect harmony.
Down Hill Racing, Top downhill action and news for Mountain Bikers, a very FLASH site with great links