Appreciate all the info I found here... thought I would share my experience.
Purchased an HLP4663W from BB, delivered yesterday, after reading here about so many issues, I wanted to confirm what I have seen, looks great sitting in family room nook/built in shelf area,almost plasma like as far as asthetics ( if it weren't for the stupid speakers at the bottom which will likely never play a sound).
Rainbow effect: not here (but I keep my head still when i watch TV but now I am thinking of trying out shaking my head to see if I can see a rainbow)
Lip Synch: can't detect it on HD through cable with DVI to TV and optical to receiver, maybe a little bit on old DVD player w/ component video and digital coax audio but I thought I noticed it before on 31" CRT when watching Nemo (as was the test for HLP).
Smudges: nope just finger prints from install.
Lines, dots, stuck mirrors: nope
HD Cable: ______ (speechless)
SD Cable : some suck some OK (suck is relative to the HD channels)
Digital Cable: good (sure wish everything was HD though
No panorama with DVI input on regular size images (going to try to use an additional video out of cable box to other input to allow me to stretch ESPN until TimeWarner gets an HD deal worked out) sort of sucks
IMHO this TV kicks ass....
OK OK I do have a problem though and the authorized serv. tech is coming out tomorrow... there is a piece of dust dirt debris lint, somewhere inside the TV blocking light onto the screen... not mirrors stuck b/c I can see strands or fibers on one end... you can see it when the tv is off also... I didn't notice it for an hour or so but when I did I cant stop seeing it from 9-10 feet away, from 15 - 20 feet one can not see it...