How I make mixes:

Cubic Carrot Software's Beat Counter to work out the BPM of each song.

Syntrillum's Cool Edit Pro to do the multi-track editing, time stretching and phase effects.

Lots of patience and time.

A good selection of music (>300 CDs) (note: this is not enough).

And, yes, Tony is right. In fact, if you email me your name and address I'll send you a CD with all the mixes I can fit on it. If you feel like it you can donate money to me via PayPal. (not sure how to include a link for it, though).

Have fun,

Paul