Physical DPS hit rating cap for anyone that doesn't dual-wield is +9% (142 hit rating). This includes Hunters, Arms warriors, Ret pallys, and us. It's also the hit cap for specials. White attacks for classes that dual-wield have a base miss of 28 or 29%, so rogues, Fury warriors, and Enhance shamans need much more hit rating.
Some classes have talents that add up to 9% chance to hit (*cough* shaman *cough*), so their hit cap is lower. We're actually the only physical DPS class that doesn't have some kind of hit talent (not counting Improved FF, since it's 30 pts deep in Balance). At least we are getting an expertise talent in WotLK.