Music with a good beat can make an hour of working out fly by. I'm always looking for new music to add to my mp3 player!
Here's what my list looks like right now:

Kelis- Milkshake (Shamelezz Remix)
Sisqo- The Thong Song
They Might Be Giants- Older
Sarah Connor- Bounce
Black Eyed Peas- Hey Mama and My Humps
Front 242- O Fortuna
Justin Timberlake- Sexyback
Gwen Stefani- Hollaback Girl
Prince- Let's Go Crazy and *&^%^ Control
Shriekback- Nemesis
KMFDM- Juke Joint Jezebel
NIN- Burn
Sisters of Mercy- Temple of Love and This Corrosion
Madonna- Ray of Light and Like a Prayer Techno remix
Maroon 5- Harder to Breathe
Usher- Yeah
Couple of LOA songs I can't put here :eek:

For cooldown:
Seal- This Could be Heaven and Kiss From a Rose
Urge Overkill- Girl, You'll be a Woman Soon
Maria McKee- If Love is a Red Dress
Royksopp- Remind Me

So what's on your workout list? Or what do you like that you think would make good cardio music?