> But even so, no matter what software I use, if you move the mouse in a 
> circle, it draws a square with rounded corners. It seems the mouse is very 
> keen to move in the horizontal and vertical directions, and resists moving 
> in any other directions. Very irritating...

Try turning off mouse pointer acceleration in control panel (I think it's 
called "Enhance Pointer Precision" now) - the algorithms used in Windows are 
quite complex to make the mouse move around in a "natural" way, but are 
useless if you're trying to draw something carefully.  Turning off 
acceleration makes it a linear relation between mouse movement and pointer 
movement.

IIRC one of the improvements in Vista was that pointer acceleration is done 
on a vector basis rather than on the x and y axis separately, which would 
probably explain why drawing a circle gives a rounded square in XP or 
earlier.

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