Love my 12" PB 1.5ghz. Running Leopard on it. But the memory cap of 1.25gb with 256gb soldered on to the board (and only one memory slot) bugs me. Especially since this is the same logic board that goes into the 12" iBooks last revision that have 512mb soldered on to their boards. (Their memory cap is 1.5gbs and it does make a difference, especially on the 1.42ghz iBooks). I just asked Gary Dailey of Daystar if they could solder a 1 gig chip on the board.. seems like a better "upgrade" than overclocking with Leopard's memory demands... Will let MR know if this can be done. If so, i'm in.