picks from my ipod workout mix include:
cardio: death from above 1979, m.i.a., bloc party remixes, the faster hot chip tunes, yeah yeah yeahs (rich, y control, etc), n.e.r.d, q and not u, lots of mash-ups a la girl talk.
slower beats for cool downs and strength training: slower hot chip tunes, peter bjorn & john, tv on the radio, beck, etc.
plus i have a lot of one offs on my workout mix.