Topological blog

Those who are interested in mathematical aspects of string theory and the newest twists and turns in topological string theory in particular should look at the KITP weblogs, especially

• Mathematical structures in string theory

written by Andy Neitzke. Andy is one of the coolest bigshots among recent graduates, and because he is also a clear expositor (recall, for example, his and Cumrun's review of topological strings), you should try to look at his comments.