On this page, we have corporate data being used to support usage in educational environs. But there is a point of learning present in the blogosphere - whether these be used to study e-commerce, politics, webmastery or academic subjects. A bit thick in the write-up, but Winer and Pirillo are on board for this as well as Scoble.
The Community Engine Blog: A Learning Blogosphere (1): Into the Deep:
"Ultimately, blogs are probably a tool best suited for a constructivist learning environment."