Ideas are worth nothing on their own. - Rob Walling

How much your ideas worth? http://sivers.org/multiply

Startup ideas are not million dollar ideas, and here's an experiment you can try to prove it: just try to sell one. Nothing evolves faster than markets. The fact that there's no market for startup ideas suggests there's no demand. Which means, in the narrow sense of the word, that startup ideas are worthless.
http://www.paulgraham.com/ideas.html

http://anttiakonniemi.com/2010/09/20/ideas-are-worth-nothing/
http://www.softwarebyrob.com/2010/10/14/startup-marketing-part-6-why-you-should-start-marketing-the-day-you-start-coding/