Today I found some information about 2 contests that I want to share with you:

Defected launch the Dig out your soul producer contest 2010 in partnership with ableton, traxsource and loopmasters.

And for the german midi controller djs, Vestax presents the digital-dj-battle 2010.
This one goes out to the pure midi controller jockeys, no turntables,  external synth or other gear allowed. So DVS users, leave your timecode vinyls at home!