I know many of us probably subscribe to about all we can handle right now (how often do you "mark all as read"?) but here's one more blog for the mix:
The SLA Academic blog is the blog of the new SLA Academic Division. While the blog will serve as a newsletter of the division with some posts about division activities, it will also include commentary and links of interest relevant to academic librarians from any subject discipline. With authors from a wide range of libraries around the world, this is one worth adding to your reader.