The British Library is one of the world's great libraries and its blogs are quite excellent as well. These streams of thought and commentary are crafted by curators, subject specialists, and guest bloggers and on any given day might include "Jokes for David Frost," "Dogs: Medieval Man's Best Friend," and thoughts on Shakespeare's "Measure for Measure." All told, there are over a dozen blogs here and they cover American studies, medieval manuscripts, science, and cartography. The cartography blog is a real pip, addressing topics such as the geography of music festivals and the whimsical sea monsters that grace many ancient maps. Visitors can search through each blog and also elect to sign up to receive updates about new posts.