Just popping in to post this. I have a meeting with my son's teacher today and in preparation was looking up more information about Executive Function and how to improve it, and I found this website: learningworksforkids.com

They have reviewed a lot of the most popular computer/wii/playstation/DS games out there and analyzed which executive functions they can help kids work on. I haven't had a lot of time to explore yet but it seems like it might be a useful resource.