I play WoW the most, and also surf [H]ardware sites, and listen to music, never watch movies with PC, I have Home Theater upstairs for that.
So I am mainly looking to get more immersed inside the game, would a larger 37" screen do that more than a high rez 30" Display ??
If you don't mind losing the screen real estate, which you probably are used to, then I would assume that the extra 7" would kick ass in games!
I believe you can HALF the horizontal and vertical res with most (if not all?) LCDs and it'll work as native. It's pretty self-explanatory, but HALF is a huge drop in resolution!!
My 1920x1200 2405fpw would have to be at 960x600 to stay native at a lower res... that would look UGLY!
Yes you probably can half it on all LCD's, but the 30" is basically the first one that it makes sense on, since it's actually a standard resolution you can halve it to. Obviously it wouldn't be as sharp and nice looking, but it can be done.