Richard Price, a philosopher at All Souls College, Oxford, has just launched Academia, a social networking-type site for academics. The site aims to display every academic in the world - from graduate students to emeritus professors - in a tree-like structure of universities, colleges, departments and so on. The idea is for each academic to create a personal page on the site (here's mine, here's my supervisor's), which then lists her research interests, websites, papers, conference presentations, and so on. There is also the equivalent of Facebook's "friending": you can add someone as a "contact", which, like Facebook, then sends that person an email to confirm the connection. All this information is then browseable via the above mentioned tree, which displays how people are connected to their departments and colleagues. It's a bit hard to explain so have a look at UKZN's slot on the tree.
By the way... I haven't yet mentioned Academic Blogs, a wiki for listing academic blogs and thus a great way to find serious reading material. Ionian Enchantment is listed under Neuroscience / Cognitive Science and even has its own page.