I'm wondering specifically for the GameCube, how can I record myself playing. 

My TV has two interfaces -- RCA sockets and a coax socket. Standard for most TVs, I guess. I currently connect my GameCube to my TV through the RCA cable, but there is an adapter that goes to the coax socket if I need to do that for some reason.

I was just wondering two things:

* How can I get the image from my GameCube onto my laptop? It has HDMI and VGA inputs if that helps at all.
* How can I record it?