from Paul Dourish's reading list for ICS 234C: Computing and Cyberspace come a couple of interesting papers about blogging:

Nardi, Schiano, Gumbrecht, and Swartz. Unpublished. I'm Blogging This: A Closer Look at Why People Blog. [pdf]

Herring, Scheidt, Bonus, and Wright. 2004. Bridging the Gap: A Genre Analysis of Weblogs. [pdf]

and loads of others interesting stuff (obv.)

[via: OLWeekly]