Andrew I don't have adsense, etc on my blog so I can't answer that question from personal experience. I did, however, stumble across
this article which is a good guide to SU. It basically says that traffic from SU has a very low Adsense or contextual CTR as people can just as easily stumble the next site within seconds. As per my previous post, though, an article that goes viral would seem to have a big impact of rss subscribers and return visitors which can only be good in the medium to long term.