You basically need a TV tuner card, which you can pick up for around $50-100 depending on what you want for features. Software is included. If you want to hook up your DVD player, VCR, Camcorder, and/or your cable TV, then you will need to look at the input features closely.
A few guys here have them, I'm sure they'll chime in once they see some activity in this thread.
Nevermind

I type too much!