I just drove about 200 miles today in my picup. I put in Lynyrd Skynyrd's greatest hits & Aerosmiths's Get a Grip.
When I went to Philadelphia (about an 8 hour drive) I put a ton of great stuff on my girlfriend's 1gig mp3 player and ran it through my truck's stereo. Lynyrd Skynyrd, AC/DC, Beastie Boys, Toby Keith, Areosmith, CCR, Kenney Chesney & much more! Put it in shuffle and didn't hear a single repeat on the whole trip