I'm playing on an LCD tv, with a smaller 24" widescreen next to it for my main.

The LCD tv is 1920x1080 pixels wich gives a high enough resolution to read quests and chat logs on my add's. I also use it for solo play as my main screen, for WoW it's fast enough

Btw, I used to have it like this:

Also worked very, very well, but the 4 adds on 1 screen makes it easier to use both screen for other stuff aswell.... (and the viewing angle kinde sucked, with the screen 90 degrees rotated)
+ my 5 wow's are now the exact same ratio.

If you have a tv like this 'laying around' ... Go use it 8)