Arduino owner since December 2007, happily using my cute little Asus Eee PC for the programming environment. So far I've just done the requisite blinky lights but I want to move on to a motorized persistence of vision display, probably a clock. Oh yes, and a CNC mill using steppers scavenged from an old printer and scanner...
Have just implemented Conway's Life on the Arduino + LED matrix: http://www.youtube.com/watch?v=tOruWC0Hqqg