Thanks!
A would like to actually add an Agilent paper on Network Analyzers. It has great, neat and explicit epxplanations.
It actually explains a huge part of basic RF Voodoo. For example it has full basic explanation of Smith's chart on one page.
Agilent Network Analyzer Basics:
http://cp.literature.agilent.com/litweb/pdf/5965-7917E.pdf