I've been keeping my eye on embedded computers lately, particularly the Soekris 4801. Well, I finally bought one. These little computers are really cool. You can install Linux or BSD on these little devices and pretty much have them do whatever you want. I didn't get a hard drive with mine, I'm going to use an old 512 MB Compact Flash card to hold the OS, which will be more than enough room for what I'll be using it for.
You can use these embedded systems for a variety of things, but I am going to install m0n0wall on this device. As it says on the m0n0wall web site: