Fun stuff. I just did a similar project (also with a laser cutter): <a href="http://instagram.com/p/rkX2rzQHQS/?modal=true" rel="nofollow">http://instagram.com/p/rkX2rzQHQS/?modal=true</a><p>I used <a href="http://maperitive.net/" rel="nofollow">http://maperitive.net/</a> - a fairly clunky windows app that turns open street map data into vector artwork (that requires a LOT of cleanup).