So Infinity Ward ditched dedicated servers for the PC version of Modern Warfare 2, eh? It's of little consequence, as it hasn't taken hackers long to enable a workaround, bringing the feature back.
And here it is, in action. With predictable shenanigans in tow. Whether it's actually better than IW's present solution is another matter, but really, that was never the point here. No, the point was just to show IW's decision could be reversed, and that point has been made.