I was just taking a look at the BTO memory options for the 12" Powerbook and the new 12" ibook G4. As far as I can tell from the Apple site, both machines use the same memory - PC2100 DDR266 SDRAM SO-DIMMS. BUT, adding a 256MB DIMM to the ibook costs $50, but adding the same DIMM to the 12" Powerbook costs $100, double the price! Same with adding a 512MB DIMM - it costs $150 with the ibook but $300 with the Powerbook. As far as I can tell these machines are using exactly the same DIMMS. Am I missing something here?!?!?!