Ideas are worthless. I really have a problem with people who either think that they are so great just because they've come up with an idea or people who think that a great idea is a pre-requisite for a successfully program/business/you-name-it. So I'm not going to pass up the chance to link to someone, who shares my POV:

Ideas are easy. Books are hard.

So please, repeat after me: ideas are easy; it's the execution that matters. God is in the details.