So far I actually found most of my games, even the slightly older ones, support a wide screen aspect.
The only one I really have any issues with is SH3, and what used to be a round periscope is now horizontally egg shaped. But it's not too bad, just that it's noticeable until you get into the heat of the game and forget about it. Ubisoft really screwed the SH3 graphics anyway. There's zero options. zero. You're stuck with 1024 x 768, and no settings options.
I'm not sure what to say about the FPS thing. Honestly I didn't really change anything settings wise (AA or Vsync). I am using DVI, so it's not the refresh rate.
I just know that with my old 17" CRT, with a game like C&C Generals, if jumped up from 1024x768 to 1024x1028 the game got noticeable stutter and I had to back the resolution down. With the new LCD, I crank up to it's native 1680 x 1050, and get fine framerates.
I don't understand it, but I like it. A large widescreen LCD is definately a worthwhile investment for a serious gamer. Games look beautiful on it, and you don't realize how much smaller your old monitor was until you realize you're now actually turning your head to look left and right on the screen.
The price wasn't so bad either. I think I payed $500ish? It's probably posted above here already.