ikiMap - Map & Win Competition
Google Map creation website ikiMap are giving away an iPad 2 to one lucky map creator. To have a chance to win the iPad 2 all you have to do is to create a map at ikiMap any time between April 5 and May 22.
ikiMap is a free web service which allows its users to create and share maps. Users can create their own maps (by uploading files in KML or GPX format or directly by drawing on the map), vote for other users' maps, add comments, create groups of friends and create their own themed channels.
Open Data Challenge
If you are a European Google Maps API developer you could win yourself thousands of euros by entering the Open Data Challenge.
The Open Data Challenge is challenging designers, developers, journalists, researchers and the general public to come up with something useful, valuable or interesting using open public data. There are cash prizes available for applications, visualisations and even just for ideas.
Programmable Web - Programming Contest Guide
Programmable Web, the excellent directory of APIs and mashups, keeps a list of ongoing and recent programming contests.