Amanda,
I don't do much running, but I do know if I want to get in an intense mood during a workout, there are quite a few artists that put me in "that" mood.....
Btw, I am a certified Spin instructor (cycling) and teach twice a week at my gym. My classes are usually packed......and everyone says it's because of my music.
Godsmack
Linkin Park
Korn
Nickelback
Papa Roach
Rhianna
Beyonce
Justin Timberlake
Christina Aguilera
Nelly
Funky Green Dogs
Paul Oakenfold
The Crystal Method
Josh Wink
Hindi Techno (cause I am Indian.....

)
....I would have to mail you a CD with a few tracks cause you might not find them anywhere available for downloading. My classes really like the beats with an alternative language.......
Too many to remember right now............
That should get you started....when I get off work I will log on to my library and copy and paste some artists/tracks that will knock your socks off!!
Esh
p.s. A lot of the artists I listed are quite good, but there's always something to be said of finding the right remix utilizing that artist with a bada$$ remix in the background. It's adds a little flavor to the track.