New Square 'Book AC Adapter

is described in detail in this Knowledge Base article. The article includes two excellent images, one is shown at right. The new AC adapter fits all models of the PowerBook G4 and iBook (Dual USB) and can be bought in November as an accessory from the Apple Store under Accessories->Portable for $79, an increase over the cost of the yo-yo style AC adapter. We may be in a minority but we'll miss the yo-yo.