a LONG LONG time ago I played games on a 27 inch CRT using Tvout from a Canopus Pure3D Voodoo1 card (with 6mb of ram!.)
It looked ok, but not great since it was 640x480. Was cool to have a "big screen" instead of a little 13 or 14 inch CRT....
Since then I ocassionally hooked up a PC to my old 61inch Rear projection set, but usually I would only hit 800x600.... sitting a great distance away, it worked fine, but really not that great.
I played a lot of games on an older 26inch 720P LCD, back on a GeforceDDR or Geforce 2 GTS.... you really couldn't get much higher resolution, and at the time, I had a 19inch CRT, so the LCD was a nice upgrade for some games.
Since then, I've hooked up a 1080p projector in the basement to a 106 inch screen, haven't done any gaming on it as I haven't bothered hooking a PC up to it other than my laptop when I was first calibrating it....
I've also got a 1080p 42inch in my living room, but, PC hasn't been hooked up to that either....
Eventually I'll put together an HTPC and give it a semi decent video card, but I'm just too used to sitting a certain way at my desk with my model M keyboard and a nice laser mouse that I dunno if I could get used to gaming another way.