From the Tour of California website:

"The 2008 Amgen Tour of California roster includes the following 17 professional cycling teams:


Astana (LUX)
Bissell Pro Cycling Team (USA)
BMC Racing Team (USA)
Bouygues Telecom (FRA)
Crédit Agricole (FRA)
Gerolsteiner (GER)
Health Net Presented by Maxxis (USA)
High Road Sports (GER)
Jelly Belly Cycling Team (USA)
Kelly Benefit Strategies/Medifast (USA)
Quick Step (BEL)
Rabobank Cycling Team (Netherlands)
Rock Racing (USA)
Saunier Duval-Scott (ESP)
Team CSC (DEN)
Team Slipstream Powered by Chipotle (USA)
Toyota-United Pro Cycling Team (USA)"