I thought it was a slightly original idea but a quick search on google tells me that everybody is doing it. Personally I'm not interested in doing that sort of thing, but some of you probably are. You could save mucho money on all your electricity needs and "specialty lighting" if you're into that sort of thing.
Cover your whole roof with those things and you can make money selling it to the electric company. You would probably have to buy and have installed the solar power converter, but I think the panels themselves are the most expensive part of the set up.