At Tom's Hardware site: http://www6.tomshardware.com/

They have good new and older guides like this one on.
Building a Digital Video Capture System.

Part 1:
http://www6.tomshardware.com/video/20010524/index.html

Part 2:
http://www6.tomshardware.com/video/20010801/index.html

Have fun Building your Digital Video Capture System.