Thanks to the work of a few, hardworking individuals the only thing stopping me from running linux full-time on my ibook has finally been swept away: the wireless network card (AirPort Extreme) is now working. This blog entry is the proof!
Steps to reproduce (assuming you’re using the precompiled debian kernel):
# apt-get install bcm43xx-fwcutter bcm43xx-modules-2.6.15-1-powerpc
If you’re not presented with an option to install the firmware, execute
# dpkg-reconfigure bcm43xx-fwcutter
Then load the module and bring up the interface
# modprobe bcm43xx # ifconfig eth1 up
The following command should give you the necessary information about your network
# iwlist eth1 scan
Then configure you wireless interface with your specific settings. I did
# iwconfig eth1 channel 11 # iwconfig eth1 rate 11M # iwconfig eth1 enc <secret password> # iwconfig eth1 essid "Erik"
The last step, getting an ip address
# dhclient eth1
Surf!
Links to more information:

A new support forum has just been started. The “official” multilanguage support forum can be found here: http://bcm43xx.spugna.org/.