Recently I've just read about the Raspberry Pi 2 and it's making everyone have a "Geekgasm" if that's the appropriate word. and i won't say I've never heard of it cause i have, but i personally don't know what it does or what people use it for.
$35 computer that uses very little power go look up raspberry pi projects
Use it as a server, a controller for internet connected devices (internet of things), a thin client or terminal to a larger machine, a small HTPC (openelect)
The only limiting factor is your imagination and ram, lol
This what I will be using my pi 2 for: https://yunohost.org/#/install_on_raspberry
Yep. Computer on a board for 35 bucks, which can handle pretty much any relatively low resource job you throw at it, and use very little power in doing so. So long as you have a need or want for something like that, they are fantastic.