Automatic Weekly build
Stable Release Builds - There has been lots of requests to provide more up to date packages between Ubuntu releases. This has been achieved by occasional backports, but for many users the backports still aren't sufficient. To solve this problem, Mythbuntu will be doing automatic weekly builds of the 0.21-fixes branch.
Trunk Builds - Many users opt to use trunk for features only available in development versions. It is also a good way to help with MythTV testing. Please note that these builds are not as optimized as regular builds to make it easier to debug them, so you may run into performance problems. By using the trunk builds, you sacrifice the stability afforded by a regular release cycle. If you are currently on a regular release, backup your MySQL database prior to enabling trunk builds. There is no returning to regular releases after enabling trunk. The trunk repository is usually built from the SVN trunk. When a major release branch is created for an upcoming release, trunk is changed to follow that branch. When it's released it is changed back to trunk.
Mythbuntu Repos - This program will install and configure the weekly build repo for you. Just install this program and it will ask you which version you want to use (-fixes or -trunk), and which repo you want to use (US, UK, or PPA). During install you will also be asked if you would like the -testing PPA activated.
If you already have the Mythbuntu Repos package installed and would like to activate the weekly builds repo, or just want to change which Mythbuntu repos you currently have activated, from a command line just do 'dpkg-reconfigure mythbuntu-repos' and the Mythbuntu repos will be deactivated and you will be asked which ones you want active again.