What would be interesting to think about implementing, if I were doing this, is a way to notify users when a third-party site causes a socialthing! service interruption. Especially if st is aware of an external issue, as with the Flickr API (mentioned in the reply to the problem I reported yesterday).
This would have been useful to me yesterday @Twhirl when it suddenly dropped avatars b/c the Twitter API changed twice in a few hours. Other users complained about Twhirl, not realizing it wasn't the product's fault. It'd be unfortunate for people to leave st b/c of something that isn't your site. Generally, some users also complain about "features" of third party Twitter clients that are actually attributed to the API (like that max # of tweet requests you can make in an hour).
A possible downside to this may be notifying users that something is temporarily effed if they aren't already noticing it, although it might be worth it to users who are noticing errors to know it's not st.
You've probably thought about this already, it's probably a buttload of feedback mediation work but you guys do such a stellar job already, I can't help but think the idea may be useful and possible.