I have a Samsung 2233RZ - 22" 120hz display - 1680x1050 resolution.
I think it's amazing. Motion is unbelievably smooth compared to my old Dell 2405FPW, especially in FPS games. I noticed an immediate difference when I started up Bad Company 2 for the first time after switching displays. You can turn VSYNC off with no tearing at all.
There is a good
thread over on the HardForum that has all of the info for the various 120hz models that are available as well as the ones that are coming soon.