I had fun playing around with the challenge and spent most of the time poking around with map exploration as implementing min-max once again isn't too much fun. I ended up having the most fun playing around with the idea of an anti-object . The simplicity of anti-objects combined with the low memory and low cpu overhead was very nice. Wrote it up in a little blog for others:

http://benjamin-meyer.blogspot.com/2011/11/using-collaborati...

Any ideas for a type of challenge that wouldn't be reduced to mostly min-max for the ranking, but could explore other concepts?