While doing some work in the eprint arXiv I stumbled over this paper explaining the Smith Chart.
It is written by F Caspers at CERN and is probably intended for RF people working with particle accelerators, but generally speaking when it comes to RF, it is still all about feedlines and loads.
The Smith Chart is another one of those things in radio that has always been mysterious to me so I am always interested in anything that might be readable and help me understand it. The abstract and links for downloading the paper are here:http://arxiv.org/abs/1201.4068
p.s. For those unfamiliar with the arXiv, the X in arXiv is supposed to be the Greek letter Chi (X) so the arXiv is pronounced "archive."