The actual install of KnoppMyth went pretty smoothly. I use the Systm Episode 2 video as an overview for the basic configuration. The only thing they didn’t cover was the Myth setup for the PVR-500 card. The trick (as documented here) was to configure each of it’s tuners as a separate video device (ie: /dev/video0, /dev/video1) with both using Tuner 0.