1) the Doors - Break on Through (To the Other Side)
2) Lynyrd Skynrd - Free Bird
3) Tom Petty - Runnin' Down a Dream
4) the Eagles - Take It Easy (Live version from Hell Freezes Over)
5) Born to Run
There are tons more on my iPod, but these 5 are great to run to, either the lyrics, melody, maybe both, make them fun songs and great to run to.
Friday Five with Eat Pray Run DC, Mar on the Run and You Signed Up For What?!