Capturing them for later viewing? The only ones I have found that work are the ones that you bring up the feed, set a box and it records X frames per second. I think they do some with sound, but I have never played with one of those. I would have to look on my desktop at home to see which one I tried.
I know someone out there that captures the buffer and "records" that, I think it is a multistage process though.. capture buffer, convert buffer, pray that it works.