AJAX form editing and design

Answer 1

You could build it yourself using an AJAX framework like ASP.NET AJAX or even telerik controls. You could use jQuery but ASP.NET AJAX is free and embeds well with ASP.NET pages. You could buy something, but I've yet to encounter packages as such.

Answer 2

The AJAX control toolkit is free and would work for some of this items shown in the video. However, JQuery has tons of plugins it is easy to extend and even easier to use. I would suggest starting there and extending it where needed.

Good Luck