Tombstone-f sent in a cool update on a project that I continue to keep an eye on. MythTV has become a dominant force in the do-it-yourself media-mega-box space, so any improvements to the UI matter significantly. "One of the biggest new features of the next version of MythTV (version .22) will be its new user interface. This new interface will offer many new features to MythTV, including animation, better interactivity, and faster and easier development for themers and developers alike."
I think it still has a ways to go to compete with some of the more mainstream PVR boxes in terms of minimalism and good use of whitespace, but hopefully the improvements will get more people into the door.