YackPack has great potential for education. In fact, one of the founders has a day job as a research at Stanford who also teaches (occasionally) in the School of Education. You learn more about using YackPack in education.
This is my second look at YackPack. I was really excited back in 2007 when I learned of YackPack, but never incorporated it into my life. I think this is going change as I can already see multiple ways of using this technology. I will give you an update in six months from now.
PS - if you want to read more about YackPack check out this overview.