From my personal stuff that gets me pumped I recommend the following. This is a short overview of some of my stuff.
Pearl Jam
Even Flow
Once
Porch
Why Go
I usually use these when doing abs. I occasionally use Porch on the trendmill I don't know it's something about the begining of the song that gets me pumped.
Metallica
Battery
Enter Sandman
Eye of the Beholder
For Whom The Bell Tolls
Master of Puppets
Ride the Lighting
Seek and Destroy
The Four Horsemen
I use all of these a lot. My personal favorites to use on the trendmill, bench, etc is Battery, Master of Puppets, and Seek and Destory. Seek and Destory for some reason always makes me feel like the pro wrestler Sting.
Sevendust
Alpha
Angel's Son (When I am in the steam room or waiting for a ride.)
Black
Clueless
Deathstar
Denial
Driven
Enemy
Face to Face
Home
Inside
Pieces
Praise
Prodigal Son
Rumble Fish
Seasons
Suffociate
Terminator
Waffle
I'm a very big Sevendust fan I pretty much use 90% Sevendust when I am working out