Nintendomax, a french homebrew development community and news page, have announced their Wii Coding Competition 2009.
There are two existing categories, Games and Applications. Deadline is the 31st May 2009. Some of the prizes are 1 Wii, 1 DSi, 2 DSLite and more.
Also check out for the upcomming PDRoms Coding Competition v4.01, which will be fully announced on 2nd April 2009.