I seem to have missed one of the current hypes on the net: linerider! Very addictive, draw a line and let the boy ride it. But you have to design it so that they boy doesnt crash. See also linerider.org and the original linerider.com. Lots of videos to learn from at klingt.net and youtube. In the current version there is no undo or eraser, which makes it very hard to draw something cool. See also wikipedias entry on some copycats.

The work of steven is really incredible!

And can only be answered with wowsers!