Introducing: Starboard
Hi. I made another thing. It lets you star projects on GitHub, off GitHub, and optionally write a little note next to it.
It's tiny, and works. Since it is read many times, but written to rarely, it simply employs a static site generator every time a star is added to update the main page and RSS feed. We get really nice performance characteristics out of reads this way, and writes still only take a fraction of a second.