We already made an official announcement about it, but I wanted to post again about the Twisted Community Code project on Launchpad.
After (nearly) two months, I think so far I'd call it successful. There are currently thirty-two projects registered, with a variety of technical areas covering concurrency, deployment, testing, protocol implementations, games, and more.
I think this is turning out way better than our ProjectsUsingTwisted wiki page, not only because it's easy to add your own Launchpad project, but also because it gives users a direct and easy way to get access to the source code and bug tracker for each of these projects.
The 'tx' naming convention is also turning out to be pretty cool; I'm amazed at how many projects have adopted it in the couple of months since it was proposed.
Anyway, if you have your own Twisted-related project, I encourage you to register it in Launchpad as a member of the tx super-project. If you're just looking for libraries to help while you're writing your Twisted-based application, it's also a great place to check.