Very comprehensive site that has many useful features, including daily podcast booktalks. I often suggest the site to teachers looking for books of a particular genre, theme, etc. Some of her pages that link to this are now wikis.
John Schumaker's (Mr. Schu) blog. Recently featured on the cover of SLJ, he's a Chicago area librarian. This page shows the top 10 books in his library this year, complete with author/book videos for each title. Great idea for reading promotion.