Excerpt from Rework by Jason Fried & David Heinemeier Hasson (creator of Basecamp)
Ideas are cheap and plentiful. The real question is how well you execute.
Think your idea's that valuable? Then go to try to sell it and see what you get for it. Not much is probably answer. Until you actually start making something, your brilliant idea is just that, an idea, And everyone's got one of those.