Usually when the urge strikes, my day job starts taking up too much time, or life happens, or I realize my idea is stupid. This time, however, I'm just going to go for it. I don't care that the product I'm building is in a VERY crowded space. I don't care that there's no 'killer feature' to draw the crowds in. I don't care that it really isn't that marketable. It's a product, and I'm building it -- and while I don't expect it to set the world on fire, I've stutter-started enough times in my life that I feel like just finishing something and releasing it will be a huge step in the right direction, so that's what I'm doing.
You won't read about this product on TechCrunch, and you won't see it lauded as the next great thing, but you will be able to register for it and use it, and ideally, within a month and a half to two months. And you can bad-mouth it all you like, I'll have done... something.