sbiddle: ATI simply is an inferior solution to NVidia for H.264. Despite what many ATI fans may say on here it still doesn't handle H.264 hardware decoding properly.
My ATI solution was working fine and dandy for many months, and still is on every channel except Prime. There was/is a problem with the Prime feed with some range of hardware. The full scope of hardware that has been effected is uncertain right now. It would be nice to hear from an Nvidia HTPC user (with HW acceleration?) who was able to watch Prime Cricket/Prime Rugby.
Seems there are currently Prime TV problems with ATI hardware using hardware acceleration on media PCs, previous poster on a "new Tivo" perhaps.