Looking for some good DVR software

Someone I know just finished putting together a DVR using a refurbished dell PC and a nice TV tuner card by hauppauge. But the software that comes with it isn't all that impressive (though he may find a few useful features I didn't have time look for).

I was wondering if there are any better DVR software programs out there that will help him achieve his goal of building a Tivo from scratch (so to speak). Specifically, we're looking for something that will download TV schedules but not cost him any sort of monthly fee like Tivo does. The system is running XP so it'll need to run on that.

Any suggestions?

 

Although I haven't tried it myself I've heard good things about GB-PVR.

 

Yahoo Go -- Looks quite interesting and is free
http://sites.mobile.yahoo.com/go/tv/index

SageTV -- Popular and feature complete
http://www.sagetv.com/