I'd like to learn more about Unix & Linux and would like to set up a little home test server/ headless box. (I'm thinking of compiling from scratch, to learn how that works; either Gentoo Stage II or Linux from scratch.)
I'd likely only need a little bit of storage, a USB port, and a network connection. I've heard good things about the (no longer produced) NSLU2 and overheating issues with those "plug computers" made by Marvell and others. I'd like something low-powered and physically small, which is why I don't just buy/get an old box from craigslist, though I'm willing to be convinced that it's worth finding space next the couch and a few bucks more in electricity.