It's very nice. I'm gaming on a Samsumg 226BW. The games I occasionally play are below. All look and play great. Once the "wow I have a 22" monitor" feeling wears off I really don't notice a difference between the 226BW and my 20" Apple Cinema Display once I'm in a game. Considering how affordable the 22" monitors are I would say go for it nonetheless.
I did the same upgrade for reasons other than gaming. I needed more desktop real estate. However I found that games are just fantastic with a widescreen. You get such a better perspective. Supcom is awesome on it since there is so much wasted game play space used by toolbars and such. FarCry is just spectacular. It's the BEST gaming upgrade you'll see. Just make sure your card can handle the res at a good detail. What vid card do you have? what games will you be playing?
Starcraft is 640x480, even worse. You're going to have to wait until Starcraft 2 to make use of that screen. I have the same screen. CnC3 looked beautiful, as did a number of other games like doom 3. I got the cheap benq FP222W or something, and the backlight bleeding is horrible. Don't get it, as I'm exchanging this for a different one.
I managed to get one of the last ones as BestBuy during black friday for $200, should have gotten 2!!! I do lots of video editing but playing games like HL2 and FEAR are awesome, can't wait for my X1950XT to up the ante on my resolution. Its a Westinghouse which tends to have a hard to notice light leakage on top and bottom. I also have one stuck pixel which I tend to forget I have from day to day because its so hard to find with a 1680x1050 display. 22" is the last stop before you reach the 1920x1200 24" displays!
Forgot to mention how fun Starcraft 2 will be to play. I guess I do have the HD projector downstairs to use as well...