I'm using one for Chromium called Personalized Web. Good point about being able to put it in the Free Nodelet and not needing a browser extension. In my case, I was already using it to insert code (JS, HTML, or CSS) on several different sites, so it was a natural place to put it.

I think this weekend I'll add a few more features I've had in mind, clean it up a bit, and post it as a meditation.