I would recommend getting a Beagleboard[1] or a Hawkboard[2], both low-cost single-board systems with somewhat differing capabilities.<p>[1] <a href="http://beagleboard.org/" rel="nofollow">http://beagleboard.org/</a>
[2] <a href="http://hawkboard.org/" rel="nofollow">http://hawkboard.org/</a>