There are all kind of librarians. Dave Hook is a librarian working in the Canadian aerospace industry. His blog is located at http://davehook.blogspot.com
Dave certainly writes about special libraries and library specific topics. He also has an interest in Canadian genealogy. This works out because well, he is Canadian. Dave is very good a spotting and explaining trends on the library horizon.
He also had a post for library technology blogs, both for IT and Library Support Staff.
There was one that looked promising, http://librarysupporter.blogspot.com but unfortunately has since been put on hiatus. Meaning the odds are slim to none it will be started up again. Not to say there isn't any value in the blog. I plan to troll through the long blog roll to come up with more goodies.