I recently switched from using XP/RedHat Linux full time to using an iBook. And I couldn't be happier. OS X is just great. I would have loved to get a Powerbook but for now, they are out of my budget. Though, I see today that there were price drops on the 15" and 12" Powerbooks. If you're considering a 15" Powerbook, I would recommend waiting a couple of weeks. It is widely expected that Apple will unveil an upgraded 15" Powerbook at the WWDC in two weeks. It will no longer come in the Titanium case but an Aluminum one. This is good as the Ti case could chip (it was painted), hindered Airport reception and was not as sturdy as the aluminum cases. You'll probably find the new 15" will have Airport Extreme, FireWire 800, an Nvidia GF4 420 or 440, a faster G4 CPU, DDR RAM (which is useless for current G4s as the memory controller does not make use of DDR's greater bandwidth), and hopefully the cool glowing keyboard of the 17" Powerbook. All in all, the new 15" model should be a nice upgrade from the current 15" - definitely worth waiting for. At the very least, when the new model comes out you may find really nice deals on the older 15" model if you decide you don't need the new features. One tip though - get at least 512MB RAM. Apple charges a premium, so you may want to do this yourself. On my iBook upgrading the RAM was extremely easy.