I'm hacking away as we speak. I'm taking the root of what I applied to YC with and trimming it down a lot. Mostly I just want to learn the API and I think that being able to link into an existing social framework provides great benefits. There is a definite trade off when it comes to doing something solely for Facebook and I'll be interested to see if it pays off.
At my current rate I should have a beta that people can try out in two or three days. I'll post something here to get feedback, comments, and hopefully users when that happens :)