I got confirmation today from a Japanese RAM dealer (I'm in Japan) that the 1GB PC2100 (DDR 266) does work in the new G4 iBooks. For what it's worth, here is the URL for that on their (Japanese) website: <http://www.macmem.com/ibook.shtml> Great news indeed tho I would feel a bit more comfortable getting a second confirmation before spending so much (approx $500)... Rick