I would like to run my own internal pypi server, for egg distribution within my organization.
I have found a few projects, such as:
Updated: crate.io has shut down and the domain is now something else entirely.
One project that hasn't been mentioned is https://crate.io/, which seems very active. It claims to be a "Next Generation Python Packaging Index", but they have their repositories split nicely into pieces that seem to welcome customization and remixing to your purposes.