In the past few weeks, my employer (Logos Bible Software) released an application that is basically designed to help one keep track of those blasted post-it notes that end up stuck to your monitor frame. It's called NoteScraps. Why did we do it? Well, that's laid out in a post on the Logos Blog, but the answer is that it was a small, tightly spec'd application that allowed our programmers to play with new WPF goodies and learn more before doing so inside of Logos Bible Software itself.
Why do I mention it now? Well, I've found it to be daggum handy for keeping track of those little inspirations I have for blog posts an any of the three blogs I participate in. Here's a screen capture:

See? All those post-it notes that used to adorn my monitor are now easily skimmed and managed. The app is fairly single-purpose, and the trial version allows you to keep up to 10 notes. No formatting, URLs automatically located and made active. If unlimited notes are desired, then the full version is 20 bucks. More on the NoteScraps web site.