I'd like to see the XT in a notebooks that doesn't put out ~200W of heat. Stick the XT with a Prescott and you're just asking for trouble. Dell had the right idea by sticking the Ultra with a P-M, that wasy they can dedicate all the cooling to the Ultra.
Now take that idea and use a Turion/90nm939CPU with the XT = almost perfect notebook, eh?
I'm just thinking outloud........