The Eyeballing Game is pretty cool. My average error for my first set of tries was 3.81. My best was the right angle (1.1 error). The game is by Matthias Wandel who built the binary marble adding machine I first saw some time ago. Cool stuff.
Matthias also has some simply amazing marble machines, wooden machines, and projects. Woodworking is really fun. If I ever retire, I will have to check out his site and figure out how to do some of the stuff he does.
The Lunatic Express is a blog by a guy who is traveling around the world on scary modes of transportation.