I just heard about CodePlex from Microsoft. After going through some of the core features, I must say this is a really cool development community hub. You can use CodePlex to create project and share with your fellow developers. Or you can also join other existing projects of your interest and contribute. With that, you can also access some basic project management tools like forum, issue tracker, source code dissemination, project team communicator, news feed aggregator etc. for your project. CodePlex appears more or less like that old GotDotNet except this one has very simple and clean user interface and improved web performance. So I am guessing this should be the replacement of GotDotNet.