The new 15-inch PowerBook G4 has already overtaken the top spot on the “Top Sellers” list of the online Apple Store, after just being introduced on Tuesday. This is the first time a Mac has topped the iPod on the list in quite a while. Rounding out the top 10 are the iPod, the new Apple Wireless Keyboard, the Apple Wireless Mouse, Bluetooth Adapter, the new 17-inch iMac, the Brenthaven 15 Shoulder Case, the Belkin TuneCast, the PowerBook Power Adapter, and Office X for students and teachers.