Ramana Rao’s Information Flow. Ramana was at Xerox PARC, and is now at Inxight, and thinks a lot of smart thoughts about information, information visualization, etc. He’s begun a list of “49 Classics of Information Flow” which promises to be a tasty set of pointers.
Complexity Digest. A mix of super-academic and layperson-accessible links to articles on various subjects dealing with complexity, social networks, evolution, etc. etc.