I just stumbled across MyWalkingMusic.com a new website that lets you download songs ($.99/song) for all your walking/jogging workouts.
The best part is that you get to pick how fast you want each song to play (118-134 beats per minute) based on how fast you walk. I was hesitant at first because I walk pretty fast and don't want to be listening to the chipmunks singing on my iPod, but the music quality is still pretty good despite the speed. The song selection is slightly dated (think Madonna's "Vogue") but it works for me because that is all the stuff I'm listening to anyway. Pretty cool if you ask me especially because nothing is better than when you find a song that matches the beat of your workout perfectly — so how great would it be to have a full playlist? Check it out here.