Capturing from Xbox

Ok.

So, my Xbox is connected to the same monitor as my PC.

My PC is connected to the monitor (HP w2408 24" BTW) via DVI-D.

Xbox is connected to said monitor via VGA.

So, I've been broadcasting gaming to my friends alot lately, and I wanted to maybe take stuff up a notch. I was wondering if there is a PC software that would let me capture VGA from the same monitor, so I can capture video from my Xbox using my PC because they are both connected to the same monitor.

Also, I have a couple of little openings for plugs behind my computer. I can connect a radio cable to my computer, I can also connect an analog TV cable and record and watch TV. There is also another jack I don't know what it does.

Next to those two there are jacks for S-video, and stereo audio. Since the other jacks are for input, I'm assuming this will let me input S-Video and stereo audio to my computer. If I buy a S-Video cable for my Xbox, will I be able to connect it there and watch it from my computer and stream it over JustinTV?

Also, does anyone know any better programs than WebcamMax?

Also, does anyone why Ustream isn't working but JustinTV is?

I just hope this thread goes unnoticed and nobody replies to it and this is one of those dead AfterDawn boards