LinuxTV
The right point to start to build PVR is LinuxTV.org. There are DVB and VDR wiki where you can find many useful things. I knew nothing about PVR two monthes ago and LinuxTV gave me a good start. Also, you can find there DVB driver and utilities.
linuxtv.org redirects to http://www.microsoft.com 🙂
Hmm… not any more. But I like the trend 🙂
It was intrigues of enemies of Linux and open source 😉