All of CyanogenMod source code is available on Github. Github recently released this new feature which allows for more granular control over repository permissions, a combined timeline, and many other features.
The repositories are all still accessible to the public at http://www.github.com/CyanogenMod.
Owners have full access to all repositories including administrative capabilities.
Comitters have push (write) access to all repositories.
Comitter - Devices
Device Comitters have push (write) access to all device related repositories.
Read Only users have read only access to all repositories. While this is available to the public, being associated with the organization allows you to view the combined repository timeline.
Repository Service Hooks
Internet Relay Chat
A custom repository post-receive hook announces all pushes to all repositories. You can follow the feed at @cmsrc.