If you've been looking for an open source project to get involved with and have thought about one of the many PHP frameworks out there as a viable option, you should take a look at Phil Sturgeon's guide to getting involved with CodeIgniter and some of the recent major changes the project's seen.
Now that CodeIgniter (Reactor) 2.0 is out people are starting to get involved, which is great. [...] what makes Reactor so much more different than CodeIgniter has been in the past? Well that is easy, anyone can be involved whether you are a hard-core developer who is happy to jump into the codebase and start changing things and adding features, or a new user who just wants to request some new features, you can do this on the UserVoice.
He talks about some of the things you can expect from the Engineers (the team heading up the development of the Reactor branch) and some of the things you can do with your code contribution to help it get accepted more readily.