Medievalists.net recently re-ran an old article of mine, "Medievalists without Borders." Reading it now, it seems quaint that I had to explain what a blog is.
Still, the point I've made there is still valid. Others have argued with some justification that the blog is a dying genre, and that the new locus of community is social networking sites, like Facebook. I'm not sure we're quite using social networking right as a scholarly community, and I'm not even sure as a medium they are suitable for scholarly discourse except in a very narrow band.
We shouldn't be surprised to find the same issues today as three years ago -- after all, these are the same issues King Alfred faced. Only the context changes.