Delta Robot v3
You can find out about this and many more robots @ http://marginallyclever.com
This robot can be built in either a 3- or 4- arm configuration.
In a total failure of version control I called this one v2 even though it's v3. So this is v2...2. Wait until I get to v4! Then things will really get fun.
This delta robot is a signifigant improvement over the last model. I replaced the ball joints with my own design. I can now make more of the parts in house for faster mass production. It also means more of what I want: stiffer linkages and greater range of motion for overall greater performance.
It runs on the same code as the previous model and communicates with the outside world using gcode. it understands G00, G01, G02, G03, and M114. By the time you read this it might understand even more.
The next improvement will be to flip the whole thing upside down so that it can play an iphone game.