Few months ago I joined Community Kit for SharePoint team. It's a collaborative open-source effort to extend and adapt SharePoint for different communities. This project is led by Lawrence Liu, Senior Technical Product Manager and Community Lead at Microsoft (his blog runs on SharePoint). It's hosted on CodePlex, at http://www.codeplex.com/CKS.
Right now there are different editions in progress:
- Enhanced Blog Edition (almost in beta)
- Enhanced Wiki Edition
- Corporate Intranet Edition
- Internet/Extranet Edition
- School Edition
I'm collaborating in Corporate Intranet and Internet/Extranet edition as a developer. I'll publish news from this project on a regular basis.
Stay tuned for much more free releases from CKS project very soon. If you would like to contribute, please visit the project page and see where you can help.