Damnit, I missed the triple threat Campy/Shimano/SRAM debate ...
Shimano: more comfortable shifting
Campy: can get through gears quicker
Shimano: cheaper
Campy: lasts longer
Shimano: easier to find parts
Campy: easier to find replacement bits for parts
Shimano: hot cranks
Campy: hot brakes
Shimano: has a hot sister who likes you too
Campy: lets you film it
I'm really looking forward to trying out the SRAM stuff next year. My broke ass is never going to touch Force unless someone comes in the door with it, but there'll be a few Rival equipped bikes at the shop that I plan on putting some miles in with.