The TED blog has posted 7 talks on the benefits of playing video games.
In addition to the fairly well known improvements to spatial awareness and multitasking, one researcher found that these benefits were still measurable even 5 months later!
However, I do think asking the question “can’t you do something more productive than shooting zombies?” ignores the obvious — that games prepare us for the inevitable, looming zombie apocalypse. Duh!
Some good TED talks… though none answer the most urgent question of our time: What is the biggest rock?