If you have an idea for a product that you think does not yet exist, you can do two things. You can build the product, market it and then maybe discover it did exist after all or suffer all the other challenges of modern business on the slim hope you'll make your money back. Or you can blog about your idea in the hope that somebody likes the idea and implements it, or that somebody says, nice idea, but this guy did it already.
Somebody gave me a business card today and I thought about the trouble of entering his data into my phone and then I thought: why can't the phone do that directly? It has a camera and enough processing power to do some OCRing. It then file the result in my address book and everything would be good.
It's a nice idea and my first thought was that somebody had probably build this application already. But Googling didn't result into much, so I decided to blog about it in the hope that somebody mails in with an url, either something newly programmed or of an existing program.