there's a website (probably not the one you've seen) that tells you how to fold your shirt. unlike the one that usually gets linked, this one does not have Japanese narration or text, the video quality is much higher, and most importantly, the motion is slower so that you can actually see what's going on. a very nice job.
they have a step-by-step photo tutorial too, but it's not very useful. the MPEG movie is the better demonstration.