Here (link) is the original introduction, probably way more information (such as source code) then you were looking for.
Here (link) is a more friendly introduction to wufyi.com, a site where I host the above mentioned source code. You can use it for free (without setting up your own web-host).
Cheers,
Gene
P.S. Saw your edit as I was about to post, decided to post anyway. Glad you were able to find the info.