The following three blogs are ones that I visit frequently. I always come away with new and interesting information from my reading of the blogs.

http://daringlibrary.edublogs.org/
The Daring School Library Blog of the Murray Hill Middle School in Laurel, Maryland. This blog and the professional blog of Gwyneth Jones, the librarian (http://www.thedaringlibrarian.com/) are chalk full of innovative resources and ideas for school libraries.

http://theunquietlibrarian.wordpress.com/
Buffy Hamilton is a media specialist, teacher-librarian at Creekview High School in Canton Georgia. She blogs about issues affecting the school library. She also give a link to her professional portfolio that has links to many interesting sites.

http://davidwarlick.com/2cents/
David Warlick's blog, 2 cents Worth, "consists of the observations, experiences, half-baked and fully baked ideas of an 35 year vagabond educator." He is an author and a very entertaining blogger.