BPM Software Links

A handy online BPM counter (you tap the spacebar as the song is playing and it calculates it - accurate).

A simple little helper application for iTunes on a Mac (you also tap the spacebar)

A freeware BPM application for Windows that uses automatic detection (not always possible for this kind of software to be accurate all the time like the kind where you tap - but you can do all your files at once apparently)