I have written a short paper on how science-based games have been used by scientists to engage with the 'the public'. It's just been published in the journal Science Communication. It's based largely on an event I attended last September at the Wellcome Trust in London called 'Gamify Your PhD', but I also talk a bit about games like Foldit. If you want to read it, just follow the link. It's in an open repository at my university, so you won't have to pay!