Ubuntu-compliant USB WiFi device?

[Germano Rizzo]

Hi,
	I've got an Apple 12" Powerbook with Ubuntu PPC (happily)
installed. The one and only thing I'm really missing in comparison to
Mac OS X is wi-fi support, since there are no LinuxPPC drivers for my
(infamous) AirPort extreme card. So, I'm willing to buy an USB device to
provide wi-fi connectivity (I have no PCMCIA/Cardbus slots...), but I
was wondering which models are supported by (Ubuntu) Linux. Can you
please address me to something supported and with a discrete range of
operativity?
	Thanks so much in advance,
		Germano