Very neat idea, distribute the work of creating browser shots for different browsers and platform: Distributed Automatic Browser Screenshots. Not sure how will this project take off, if people only use resources and don't give back then it is not going to work. It seems quite hard for an average web developer to give back, complicated setup is needed.
One of the commercial sites I have seen is BrowserCam. While not too expensive for a commercial project, for open source projects it is almost a no go.
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