I saw this video for making ringtones from within Itunes itself, and I thought it was interesting. I don’t do it that way, I downloaded a small piece of software called Audacity (which is great, but required a little tweaking to save files as Mp3s). But this is a good start for less technosavy peoples. If you want Audacity tips, get ahold of me.
http://reviews.cnet.com/8301-13549_7-10056954-30.html