I've been using the Bloglines blog search a lot lately, and if you haven't tried it out, you may want to give it a spin. Danica Brinton, head of International Product Management and Localization for Ask.com, was interviewed about the blog search by Sébastien Billard very recently. When I first saw the interview, it was in French only, but Sébastien let me know that it was also available in English (see the pdf file in the first paragraph of the interview).
If you would like to discuss the interview, or some of the topics relating to it, such as Ask's Expertrank, there's a thread started on the topic at the Search Engine Watch Forums.
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