A week or two ago I laid out a novel idea for using SVN as the back end for a client-side installer/updater. There seemed to be some positive feedback, so I took an weekend off and a few hours here and there in my spare time and put together a quick prototype of such an application. It seems to be relativly stable now, so I'm setting it free to the world. Take a minute and look at the Downrush project.
Every so often, you are just going through your day like you always do, doing the same thing over and over again, and then suddenly it dawns on you.... THE IDEA. The big one that you can't believe how blindlingly obvious it was before you noticed it. That's what happened to me today.