I'm enjoy playing this game called FoldIt, which I've written about on the blog before. It's a puzzle game which contributes real results to research into the folding of proteins in nature; a very tough problem in biology.
The first results of our collective efforts have come through, and not only did the concept of "human-directed folding" succeed, but my team (Another Hour Another Point) was a big part of it!
We won one of the puzzles and scored in the top 3 of several others, and the developers have concluded that a pack of untrained game-players match the perform of folding experts, so they can be freed of this work and do something else instead while the Geek Hordes do most of the folding work! This is very exciting :)