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This is the Windows/PC counter part of this question.
I want to clarify that I am not talking about connecting a VGA monitor to a computer. I'm referring to plugging in a VGA output in to my computer. I want the VGA feed to show up as a video device, so that I can run a projector's feed through UStream and be able to switch between that feed and the camera that I am using. The computer is a Lenovo Thinkpad.

What hardware is needed to digitize a VGA input in real time to send for broadcast?

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up vote 5 down vote accepted

What you need (for both mac and PC) is a VGA Capture Card or also known as a Frame Grabber. High end ones that can do 30fps+ at 1920x1200 are not cheap ($800+) but if you are willing to go to a lower resolution or be willing to do lower fps it can bring the price down a lot.

If you can get a signal like HDMI or Component from your projector it actually gets a lot cheaper as the market for buying those type of devices is a lot bigger.

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Thanks so much, Scott! I was actually just looking at those frame grabbers from Epiphan. I'm will wait a couple days for more answers, then accept yours. – daviesgeek May 7 '12 at 17:58
Check the new-egg link, it is always smart to shop around as sometimes the most expensive thing is not always the best thing. – Scott Chamberlain May 7 '12 at 18:00
I absolutely will! Thank you so much of your help! Side question: can I take a VGA feed, convert it to HDMI, then run it to an HDMI to USB cable? – daviesgeek May 7 '12 at 18:34
Yes but the cost of the VGA to HDMI converter + hdmi capture card may be more than just the cost of the VGA conveter alone. – Scott Chamberlain May 7 '12 at 18:36
Ok, I will look into it. I just wanted to make sure it was actually possible. :-) Thanks again! – daviesgeek May 7 '12 at 18:39

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