All this talk of 12 inch Powerbooks is making me tear up over getting rid of mine.
I sold my baby at the height of it's popularity when the 13 inch MacBook came out and there was no 12 inch replacement in sight. I nearly traded my new Blackbook strait up for the Powerbook in terms of price, so I guess I can't complain.
I do miss it's portability but don't miss the slower G4 processor.
Mine is a secondary computer, used in place of a netbook. For what I do, the only difference I can tell between that and my 2.4 uni MBP is boot up time. I bought mine for only $400 with the superdrive, 80 gig hd, and maxed out ram, so I'm danged happy with it.