Wikipedia
LinHES
LinHES (Linux Home Entertainment Server) is a Linux distribution designed for use on Home Theater PCs ( HTPCs). Before version 6, it was called KnoppMyth. The most recent release (R8), for 64-bit machines only, is based on Arch Linux, though previous versions were based on Knoppix and Debian.
LinHES includes custom scripts that install and configure the MythTV PVR software as well as a number of add-ons. Most standard HTPC hardware is supported, and much of it is even configured automatically, making the often complex installation and configuration process relatively easy and pain-free.
Cecil Watson developed and maintains the LinHES operating system.