software advice

[happiness stan]

I have done a few mixes using garageband, what I need to do is split the file exported from GB into tracks, making sure the transition is seemless when I burn it on to cd.

Any suggestions?
I'm using a powerbook g4.

Freeware would be nice, I quite like the way Amadeus II works.

edit: on an unrelated note, is there a way to change my username on here?