For those of you wanting to create your own playlists for exercise:

http://www.mixmeister.com/download.html

The software is free (totally), and it allows you to see the beats per minute of .wav, .wma, and .mp3 files you have it scan. it’s not 100% perfect, but it does its job pretty well. I ran it on my currently library. With over 400 titles it only had trouble with 5 songs.