I love this thread. I need fresh music to keep me motivated.

Here are some I like - good for any cardio.
All purpose songs:
Smooth, by Santana
My Hallelujan Song - Julianne Hough
Who Knew - Pink
Girl next Door - Saving Jane

Get your heartrate up:
A Little Less Conversation - Elvis
Let It Rock - Kevin Rudolf
Vertigo - U2
Viva la Vida - Coldplay
Suddenly I See - KT Tunstall
Let's Get It Started - Black Eyed Peas
Shut up and Drive - Rihanna

Hills:
Stronger- Kanye West
Play That Funky Music - Wild Cherry (good for intervals)
Funky cold Medina - tone-Loc