That's really good.
Well, the last guy that reviewed this flash may be talented enough to use onion skinning on own with help, but the fact that you cared to make a tutorial for people who don't know how says that you have great potential to be a professional animator, imho. I like it. Maybe you could work on a more advanced version of this tutorial with a comic book-like character? I'm wondering if you would like your tutorial to be hosted by anyone on their site? I have a web page made for flash tutorials, and I'd gladly host it with your permission of course (that is, if you're not hosting it yourself).