I name the beats I really like and have put hours into. On the label I write the title and date.
I don't bother naming the practice beats that are just the drums and then one or two patterns with the sample. If I like it or don't wanna delete it I just save it on a blank floppy and it gets lost in the pile.
The ones that I do name, I just go off of what it reminds me of. If it reminds me of another song I heard, I name it sort of like a reference to that song. Maybe I think an accapella from one of the singles I have is fitting for the beat so I try that out and if it sounds good, I'll name the beat as a reference to the accapella. Usually the title relates to the main sample though. Artist name, song name, label, random text on the label, or whatever it might remind me of.
Works well enuff, or for now at least..