A mac programming competition (typically entries are in Cocoa), see http://ironcoder.org

After each competition the source code is available for all entries - and is a chance to see tricks and techniques used throughout the community.

The judge provides an API and a Theme - then you have two days to code a solution.

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Previous competitions have been:

*I - (March 3rd 2006) Accessibility API and Mardi Gras *II - iTunes visualization and Emily Dickinson *III - Quartz framework and Time *IV - CoreImage and Space *V - (March 30th 2007) ScreenSaver framework and Life