Paul Olgivie from CMU has a blog, Information Retrieval on the Live Web. He's recently starting blogging again after a period of absence. He also posts on his company, mSpoke's, official blog. His post on mSpoke examines what features of a blog posts correlates with their popularity.
Welcome back Paul! I look forward to more interesting posts ;-).
I meant to write about this sooner, but Jon and Daniel beat me to it.
Paul's blog is a nice addition to my blogroll.