Motley Crue - Kickstart My Heart (DUH!!! Why didn't I think of this one before??? THIS is the song to make you sweat!!!)
Outkast - BOB (another really great song to get your heart pumping. There is just something about this singer... his voice just sounds fun! I feel like I'm really having fun when I hear this song for some reason)
Gorillaz - Feel Good Inc. (Ok, this one is a WOW! There's something magical about hearing "feel good" over and over while you're working out. I almost feel like I'm reprogramming myself.. what! What's up?)
ACDC - Thunderstruck (this is another one that I just kind of have to ask myself why I didn't remember how completely awesome this song is! Songs like this always make me feel strong when I hear them!)
Greenday - American Idiot and Holiday (both of these songs are just so upbeat! Again, I think it's the singer's voice. Love them! With the tempo on these two, you sweat just listening to them. hahahaha!)
Hey, thanks to everyone for their input.... keep em coming!
Also, here is a great article from the NY Times regarding music during exercise and the scientific effects. Very Cool! I also found another great article at Elements4Health as well as a really interesting resource at MotionTraxx (check out the pic above). I'm not that familiar with MotionTraxx yet, but I thought we could all check em out. It actually sounds like a really great service, I just signed up for free! Let me know what you think.