I just purchased my first portable Mac, that being a 15" PowerBook G4, with a 1.5 GHz G4, 512 MB RAM, ATI Radeon Mobility 9700 w/64 MB VRAM, and a fresh install of 10.4.11. The notebook has the AirPort Extreme card, but it's only 802.11b/g. Didn't Apple sell an AirPort Extreme card with 802.11n? If they did, does the PowerBook even support 802.11n? Also, are there any tips I should know, being a new PowerBook owner? How's the battery life, also? Also, I just bought 2GB of RAM from OWC. I'm maxing it out.