My two cents:

- blog posts are crap if you want to start a somekind formal knowledge structure
- Blogs are a crappy but these days really affordable to write uninformal things, as a magazine
- my feeling is most towards Atom publishing repositories: atom entries associated to resources' URI's, but didn't got the time to explore it
- upon a webarch (http://www.w3.org/TR/webarch/ ) information schema you'd be able to develop, ie, formal reviewing processes, etc