I've had a look for the link but cant find it, Ive got the video downloaded to my PC but its 54 meg long, I think it was something to do with the bonus tools set although the UV unfold is NOT a bonus tool, it was just thrown in the show how to use it.
If you want a step by step tutorial or Something, then look in the help file, it goes over it.
"No pressure, no diamonds" Thomas Carlyle