I'm sure 98% of the songs/stuff on everyone's mp3 player don't worth the bits they use. So here's an advice for ya all.
One great use of my 60GB iPod these days is to learn french on my bike ride everyday to work. The 30min lessons from Pimsleur is the exact timing for my ride, and i can repeat out loud the pardon's, bonjour's, excusez-moi's. Much better than sitting in a classroom repeating, reading and writing all-at-once. You just need one (and difficult) thing: discipline.
Very soon i'll try out some podcasts, like IT Conversations, but thats another post.