http://wangsfactory.blogspot.com/2012/02/diy-gyoza.html
I like this tutorial mainly because he was very concise on the forming of the gyozas. I took a very long-winded, start-from-the-basics approach but I think it was unnecessary. He smartly used 4-quandrant photos to quickly show the process of forming, which I think makes the process seem easier while keeping it sufficiently explanatory for the readers to understand.