With the advent of DCC, there is not alot of information comparing DCC
with analog.  Please explain the difference between the two systems
(advantages/disadvantages etc) in very simple terms so that a beginner
like me can understand.

Also, please explain the various types of signaling programs (i.e.-
Digitrax vs. CTI signaling systems).  Please also compare and contrast
these systems and show how they actually work instead of the tech
jargon that comes with each system.  Which is best and the easiest to
use and wire?  This would be a great service to the hobby and to me
personally.