Not a competitor, rather a complement to the Nokia ITs. The Linksys NSLU2 is supposed to be a simple NAS device for the home: you plug it into a spare ethernet port on your router, attach one or two USB drives to it and voila, networked storage.

However the little gadget has attracted the hacker crowd who have repurposed it into a small, very low power, Linux machine. If you're bored with the Nokia ITs hacking around with this could keep you entertained for days and weeks. I use it as a low power, always-on proxy server, and keep exploring other uses for it.