This is how I now watch TV on my Mac: Apple DVD Player. This application has the unfair advantage in MPEG2 decoding. However the combination of Tiger allowing reading of VIDEO_TS folders and Myth's improved MPEG2 transcode means DVD Player and hence acceleration is possible. The job queue allows me to have the DVD folders prepared within minutes and my laptop now makes an okay frontend. Comment if you want to know more and I'll post some files.