http://chrisc.bedroomcoders.co.uk/olimex-a20-gles2-0-and-open-dynamics-engine/
Just to show what you can do with an a20... (rather unoptimised!)
All code was compiled on the A20 itself (well except the binary blobs probably *sigh*), and the code that puts it into fullscreen was actually written (just this evening) on the A20 itself...
Enjoy!
Very impressive.