I've always been a mild/moderate fan of Captions, (open or closed), but I really fell in love with them when I was in grad school, and hanging out in the Disabled Services Student lounge, discovered I could comfortably and easily watch TV while folks sitting right next to me could study for their midterms, and nobody was put out.

After I got into the habit of using them as a matter of course, I realized that I had a higher level of comprehension watching the TV news ('Cause hearing as well as reading the info helped me catch what I was missing), and especially watching cop / murder mystery films -- ever notice how the really crucial clues are always whispered, right at the moment the dramatic music flares? ;-)

Now, I have the attitude that a video without some form of captions is only half-made -- as if the person didn't bother to light their video well, or check for squealing feedback on their mic. A quick-n-dirty direct-from-webcam video is one thing, but if you're going to make something polished, and write a script for what you're going to say, anyway, it's not that much more work to adapt your script into captions...

[*climbs down from soapbox*]