MythDora is similar to Knoppmyth, only based on Fedora instead of Debian. The main point that I like is the auther of the screencast has the same PVR card as I do (the PVR-350) so the setup that is described is a good model for people with the 350 card. This version also uses a slightly newer version of MythTV than (I think) the knoppmyth distro uses, so it might be a good way to upgrade. Be good to find out if my random MythTV freezes are caused by software or hardware as well.
Update: Updated Link