I finally updated www.powerblogs.com. There are now a few useful screenshots, and best of all I rewrote the features page so that it actually reflects the current featureset, rather than the featureset from 6 months ago.
Also, I put into practice what I learned at Kaplan about "people care about benefits, not features". Or I tried to, at least. Even if I didn't completely succeed, it's a whole lot better than it used to be. Now people will have a reasonable idea of what the powerblogs service is all about.