the software i am using is called sagetv and is very good value for money
http://www.freytechnologies.com/index.html
it can import xml tvlisting files for a program guide in the us this is provided by sagetv direct but in the uk i have to use a program called xmltv to grab listings from ananova and then import them with a provided plugin.
all this can be controlled from the wintv pvr250 remote.
i also have powerdvd for dvd playback and will give dts output to the spdif.
the only thing i am waiting for is a IR tranceiver to change the channles on the sat box for me.
after installing everything out of the box it would just reset the pc everytimg i showed any sort of tv / mpeg but starting fresh with all the lastest drivers from the net solved that problem.
the satge tv is very easy to setup depending on your capture source. i used the rf out from my sat box and i had to go through all 120 channles to find the correct one.
using the p41.7 and recording at mpeg2 12mbit/s the cpu is never above 30% so the systems stays at low fan speeds all the time.
hope this help anyone looking at pvr/htpc
Lee