I've recently become acquainted with the Bibliophemera blog of Chuck Whiting, a bookseller from Texas. Whiting's blog discusses "ephemera related to books - their owners, sellers, binders, publishers, etc.". It's right down my alley because a great deal of what I collect falls in the ephemera category. Whiting even had a blog post on bibliophilately recently which is one of my major collecting interests. He has also had posts on the Booklovers Library and bookmobiles, two other interests of mine. He has another blog called Archeolibris which is about "Digging up interesting fragments among the leaves of new, used, and out-of-print books". Both blogs are worth checking out.