The videos are from the Washington Sensory Disability Services.
I've also included a link to another helpful article about HUH from FamilyConnect.org. The family friendly article is: http://www.familyconnect.org/parentsite.asp?SectionID=75&TopicID=351&DocumentID=3822
A lot of people may think that HUH is just for children who MIVI or DB. But I use HUH with almost all of my Braille reading students including those who are MIVI, DB and ASDVI. It's just the best way for them to "see" what's going on. In fact, that's my prompt language when I am going to do HUH. I ask my students if they want to "watch me do it". They just pick their hands up and I slide right under them.
A small side tidbit about HUH that has come up a lot when I have been working with OTs: how do you do HUH with preschool? Their little hands are just so small (and cute!!). Here are a few ideas: hook up under their pinkies and let their hands follow with you prompting from the pinky. I will sit facing them instead of behind them so that their little hands can see what my fingers are doing. Or I will prompt at their wrists and guide that way. As I write this, I realize that it is a tad tricky to understand if you don't get it. I will do my best to find a preschooler who I can take some pictures with and post them. Until then, watch the videos (again and again). HUH is my ultimate tool when teaching so many of my students. It takes time and practice to get the finesse of it down. Good luck!