The OpenGeo Suite team has migrated all of our source code over to Git from Subversion, and we are now hosting the code on GitHub. This follows the trend of lots of open source software projects toward a distributed version control system.
Switching from Subversion to Git has all sorts of benefits for the development team, as well for anyone interested in playing with the code. There are numerous sites that detail the advantages of Git (we particularly like this one), but it will allow us to more easily incorporate features for our clients, manage multiple release streams, and work simultaneously without breaking development for everyone else. As the client base of the OpenGeo Suite grows (and as more and more people download the free Community Edition) this change has been a long time in coming.
You can also visit OpenGeo's main GitHub repository as well as the main repositories for GeoExplorer, GXP, and more. Please fork the code and play around. If you have patches, feel free to send us a pull request. While we can't guarantee that all patches will be accepted, we value every suggestion we receive.
If you have thoughts about our svn to git conversion, we'd love to hear about in the comments section. Though please, no x-is-better-than-y wars. Each one of us is correct!