I have this link to share with you :
TweakGuides.com - A Guide to HDTVs
This is a guide to HDTVs explaining everything you want to know about it. Even if you have an HDTV, it's a good read and can explain many things you have difficulty to explain to other people less techsavvy.
I hope you all enjoy this link.
P.S I did NOT write that haha.