repository - What repositories are you using for 10.10 software?

Here is hoping that this is not duplicated somewhere else...

Back before the easy addition of Launchpad PPAs, many of us used to customize our sources list to include user/3rd party repositories. Some ambitious Ubuntu'ers would even maintain updated lists on their websites. It was the easiest way to install software for things like Google Earth in the earlier days.

So the question I am asking may prove useful for the newcomers and for the experienced.

What other repositories (like Medibuntu) have you found useful for 10.10 (other than PPAs)?