The International Political Science Association has a portal to what they claim are “the top 300 websites in political science”:http://ipsaportal.unina.it/. I couldn’t find the Monkey Cage anywhere in there, so I’m a bit dubious 🙂 But there are a lot of useful links there organized by a variety of categories, including data banks (including a sub-section on “statistical and data archives”:http://ipsaportal.unina.it/?cat=16, institutions, and e-government (although a search function might have been nice…).
