Hooked up my computer to my dad's HDTV before I moved in January and it looked great. All you have to figure is how far away you're going to be viewing the screen from. TV's have a big screen/low resolution in comparison to monitors because you and probably several other people are all watching the TV at once from further away than you would view a monitor. Pixel pitch is only relative to how far away you're going to be from the screen.
		
		
	 
I just ordered the Dell 30" LCD.  I plan to use it exclusively for gaming.  The resolution might be low, but nothing to make a fuss about.  Everyone is raving about the 37+ inch ones having 1900 X 1080 or whatever when it is pretty much the same if you scale it down to under a 30" LCD with 1280 X 768.  I guess it all depends on your personal preference.
I am currently using a 19" at 1024X768 and just to get an idea of what it would look like compariively, I set it to 800 X 600 and that is about how it will look in comparison.  Takes a little bit of math and so on, but you can figure out aprox how good the picture will look, at least the resolution side of it.
However, you still should see it before you buy it... I was going to purchase the Dell 2405FPW, but once I seen the Dell 30" in action, I changed my order.  It simply is a beautiful picture when running in its native resolution.
Some people might think it was a bad decision, but I doubt it.  I'd would much rather not be locked into a high resolution monitor. Because when games start to get too demanding for my 7800 GTX, then, well, I need to have a way to lower the resolution.  If I lowered it on a high resolution LCD, i'd pretty much destroy the picture quality.
Anyway, I know each person has their own preference, but these displays are beautiful.