The Guardian put out the second list of the Best British Blogs, and the award for the best written blog went to Belle de Jour.

...[T]he diary of a London call girl. There's obviously a prurient and titillating element, but the quality of her writing took her blog well beyond that. Some judges were concerned it was a work of fiction, but even if it is, it remains an impressive piece of writing.
As Bruce Sterling, one of the judges said: "Archly transgressive, anonymous hooker is definitely manipulating the blog medium, word by word, sentence by sentence far more effectively than any of her competitors. It's not merely the titillating striptease aspects that are working for her, but her willingness to use this new form of vanity publishing to throw open a great big global window on activities previously considered unmentionable ... She is in a league by herself as a blogger.

I agree.