Thats the monitor that I have Samsung 244T Black. I got some of the lag feeling down by making sure my Mouse drivers USB polling frequency is at 500hz or 1khz. This reduces some input lag by about 8ms (1khz can be unstable though). But doing some research on the panel, just by its nature it has 45+ms latency. (not to be confused with the panel response time) Its really to bad, its a nice panel. I'm trying to get adjusted to it, but its just to much... I even notice it on my desktop, not to mention games.
I find myself moving windows over to my 20" dell screen because it doesnt have that lag feeling and it makes life so much easier. Plus Its hard being precise with the mouse in Photoshop or Flash with the lag. I'm tempted to call Samsung support about it, even though I have had the screen for a few months now. And its a known issue... but you would think for a "professional" marketed display this kind of problem would not happen. :-\