Most (not all) people that complain about the lack of MAC spoofing funtionality simply don't have the Apple Spirit: Think Different Anyway, here's the walk-around and I'll use my Campus Network as an example: (1) Mark down your Airport ID, that's the basestation's exteranl MAC address (the address that ISP sees) (2) Spoof your computer network card's ID!! I did this in a Windows Machine because there are a lot of ready made "MAC Spoof" software. Simply change your machine's network MAC to the Airport ID you marked down earlier. (3) Connect that computer directly to your ISP. Do the registration / activation thingy. Your ISP will register your new MAC address (the fake MAC address of your network card). (4) Unplug the network cable from your computer, plug it into your AirPort. And boom! See the light go green. This method will work in any MAC restricted environment IN THEORY. Let me know your case if it doesn't, we'll sort it out together. Btw... Airport Exterme is absoulutly a crap router. (1) It restarts at least twice a day (2), become extremely slow if you do heavy BitTorrent, and won't reover even if you stopped. (3) My Windows MachineS just never manage to mount the AirDisk (but can R/W via Network neigbours)... (4) and what? when all macs are Gigalan, this thing has Fast Enthernet. (5) Oh yes, it doesn't takes any NTFS or Linux Partition. (6) ****!!!! BE CAREFUL what you plug into its USB port. I firstly put a USB hub in, sharing 1 x printer, 1 x harddrive and 1 x iPod (latest shuffle). Guess what, the APPLE version of BLUESCREEN OF DEATH!! The computer locks up and you have to restart!!! ****!!! I tried it many times and everytime it only make me feel worse. The last time i saw that screen was about 2 years ago when testing the Tiger beta.... I mean, all the problems *might* be solved by some firmware updates but again, it seems like it's APple's policy to make the first gen product junk. Two words: Hold Back.