[edit] Examples of how other libraries are using blogs

Georgia State University Library: Library News and Subject Blogs
They have one master blog that aggregates all of their other more subject related blogs. They also provide an easy way to subscribe to the main blog or each individual blog. Also, notice how they include their flickr too!
Western Springs History Blog
Joint project between library & historical society to highlight select items from their special collections. Includes images, history, and even an interactive map to find resources by location.
VCU's Library Suggestion Blog
VCU’s Suggestion Blog: a place for patrons to submit suggestions, complaints and even reference questions. Librarians then respond via the blog.

[edit] Other lists of library blogs