Since the airport extreme card in powerbook has no linux driver, I'm looking for a usb wireless adaptor supported by Ubuntu Linux. Could anyone suggest a model?

USB adapters
Sparklan 11MB USB Wireless Adapter seems to work under Ubuntu.
Acer 2413 wireless usb
AirLink Tech WLG-1100U wireless usb

I am not sure if your interested in any pcmcia cards, but any of the following should work

any of the cisco aironet cards 4500/4800/340/350 series
LinkSys WPC11 v2.5
SMC SMC2632W

I hope you can find something that suits you.

Just one question, why do you want Linux on your powerbook???
Please don't get me wrong, I love Linux. I'm a hardcore Debian/Ubuntu user. Recompiling kernels is my hobby, my passion. Editing configuration files in Emacs, whooaaa boy!!!! You can wake me up in the middle of the night for that.
My goal is actually to find a girl who can program in bash, at 25 I'm stil searching....

Anyways, enough of that.

When I migrated away from Linux to Mac OS X, I found that most of my apps I used where also available as a Fink package. I also use DarwinPorts for all of my OpenSource needs. I am also planning to install Gentoo for Mac OS X, so I can emergeeeee and still program Linux applications.

Last week I bought a powerbook 17", with Mac OS X Tiger on it. And I love it, eveything is functional and it basically just... works.
Why buy an expensive machine and not use it to it's full potential? It seems like a waste of money, on the other hand if you have money to waste I'll give you my address information and you can wire it directly through Western Union to me, instead on throwing it away.

Thanks for the suggestion.

I have PCMCIA cards but cannot use them on the powerbook, because there's no PCMCIA ports on a 12" powerbook.

I want to duel boot Mac OSX and Linux. Mac OSX is good in theory, and comes with some nice apps. But when I have a lot of work to do, I still like Linux, in which i can switch between different windows and destops easily, let focus follow mouse, and do almost everything without touching the mouse. In Mac OSX, I'm forced to do everything the Apple way, which I found awkward. I can install X11 in Mac OSX,but running it on top of Mac OSX is quite slow for a 1G powerbook, and not everything works (for instance, I cannot input Chinese characters in X11 on Mac OSX).

OSX is basically a heap of candyfloss/sh*te. The hardware is good, but that is it.

Gentoo-on mac is largely crippled by masked ebuilds+++, fink has usually only old programmes and Darwin ports just the same.

I have an ibook in dual boot, but the only times I ever boot into OSX is when I must use the wireless.

I am waiting just now only for the broadcom driver to materialise, apparently some guys are making good progress.