Here's a few. I like fast tunes for cardio; can't listen to music when I'm lifting weights, it throws my counting off
Bootylicious - Destiny's Child
Circus - Britney Spears
Crazy in Love - Beyonce
Hey Ya - Outkast
Poker Face - Lady Gaga
Show Me the Way - Peter Frampton
Single Ladies - Beyonce
What You Waiting For? - Gwen Stefani
When I Grow Up - kittycat Dolls
Womanizer - Britney Spears
Pon de Replay - Rihanna
Jump, Hung Up, Sorry, Ray of Light - Madonna
Reach up for the Sunlight - Duran Duran
Vertigo - U2
Breathless - The Corrs
Gimme Some Lovin - Spencer Davis Band
Boys of Summer - The Eagles
Can't Get You Out of my Head - Kylie Minogue
Still the One - Orleans
ETA: There are quite a few threads on workout music with great suggestions; do a search and you'll come up with lots.