I bought a NSLU2 some weeks ago. I will use it as printer and scanner server and as an ever running torrent client. As I don’t want to run a ethernet cable through the walls of our flat, I need wireless network on it. There is a nice HowTo on NSLU2-Linux. I got my hands on a wireless usb stick for 15 €, warmed up the soldering iron and got started: You really need a steady hand for soldering onto these tiny contacts.
But to my own surprise I managed to:
Inside the case of the NSLU2 there is enough space, so i just taped the new part on top of some capacitors:
5 minutes later I was really glad to see the device in lsusb.