here's a quick and easy solution:
download mixmeister (http://www.mixmeister.com/) and load al the mp3s (even the whole damn directory if you want) and let it crunch and figure out al the bpms.. real easy..
if you're talking about figuring the bpm of actual vinyal, you're pretty much SOL, since you have to do it manualy (not that hard realy, but if you got lots of records, can be a pain) or get a bpm meter (but those things are pretty inacurate from my experience..)
..hope that helped..
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