Ubuntu Personal Package Archives
Personal Package Archives make it easy for anyone to make software available through the apt system without the need to be accepted into the official repository. You can simply create a PPA and other people can add, or subscribe to them. Updates pushed to a PPA show up in users Update Managers alongside all of the official updates. Ubuntu 9.10 makes PPAs easier than ever before. To add the PPA for Ubuntu Chromium – Dev Channel, just say
sudo add-apt-repository ppa:chromium-daily/dev
A few PPAs I like are