2. I was having trouble getting videos indexed: turns out you can use "M" or the Windows-key on the remote to call up a control menu for Videos, Music, etc; I was able to rescan and find the videos I copied in.
3. I need to get an AMD / ATI card working with OpenGL properly. I found a
4. MariaDB doesn't seem to work with Mythbuntu properly.
5. I did find MySQL 5.5 in a PPA: try at your own risk!
6. Mythbuntu 11.04 is in beta: use this to avoid much pain with kernels and PPA stuff; you'll still need to follow tips #1-3 as needed.