I did a series of articles a while back for poolstudent.com, look in the instructional section or search for kicking. I cover most of the common 1 and 2 rail kicking systems with plenty of explanation and diagrams.
I was working on something similar for the standard 3 rail system (Corner 5) and some others when I quit playing, one day I'll get back to it. There is very good information on this in Byrne's first book, that's where I first learned it. Also feel free to PM me and I can send you what I have via email if interested.
Scott