Question: In the past, some of my projects have required me to create a movie version of a fullscreen Flash application. The easiest way to do this has been to get a screen capture. However, capturing anything over 1024x768 has resulted in choppy video, which is unacceptable. I understand that there are hardware based solutions for capturing fullscreen video, but I have not been able to find out what these are. My output needs to be scalable up to 1920x1080 and result in an uncompressed AVI file with no choppy-ness.

Answer: 
Various professional products support full HD capture:

<http://www.decklink.com/products/hd/>

<http://www.aja.com/>

There are others. Capturing the full, uncompressed digital or analog stream is a pretty heavy requirement.

-Adam
<http://rgb.com/>
I've looked at their product before - very high end/expensive but perfect video and it's a hardware solution so it's not processor intensive on the machine you are trying to do the demo on.