The old standby list:
anything by Ratatat
Jay-Z's Black Album
The Black and Blue Album (jay-z/weezer mashup)
N.E.R.D. stuff

Lately I have been listening to a lot of celtic punk type stuff too and its great for training.
Dropkick Murphys
The Real Mckenzies
The Pogues
Black 47
Flogging Molly
The Tossers