Stutter is the best I can describe it as, but really its other players (and for example weapons they've etc...) on screen that appear to be randomly glitching around the screen (As in their movement is not smooth, very rough and they bob around the screen until they stop moving)
Of course this makes it impossible to play games like WoW where you have to put up with potentially thousands of other players.
Now I know its not my system, because I installed WoW and another comp in my house and its still doing it. Just wondering if it could be broadband related and if anyone has heard of something similar?