Is there a product that will plug into an AGP slot, be about 20 feet long, and allow me to plug in the video card 20 feet away? You know what I'm saying?
No chance. The signals are far too fast to work over those kind of distances using a cable. I have seen a PCI extender that worked over a very high speed fibre optic link, but it was seriously expensive. What's wrong with extending the VGA cable?