Why would I want to?
Well i've got the 20" Apple Display and I was thinking of getting an Xbox 360, and using it with the display.
And I dont think the Xbox will output 1680x1050, I know it will do 1344xsomething or other, but not sure if it does more than that.
I realise it will look fuzzy at a non native res, but when its video im not really going to notice.