I had never heard of this, but thought it was interesting. This article on Ars provides a link to the actual challenge site. It could be fun to see what people throw together.
http://arstechnica.com/journals/app...-great-macmod-challenge-is-once-again-upon-us

http://arstechnica.com/journals/app...-great-macmod-challenge-is-once-again-upon-us