Its a 'problem' that all Apple laptops suffer from, and always will do if they continue to use aluminium for their chassis.
After much debating I am finally going to go for the 13" MBA ultimate. I have heard some reports that the 11 can get warm - is this the same for the 13"?
I am using a black macbook now and after an hour my legs feel like they have been cooked!
No.
I've had the 13" Ultimate for months now (good choice btw) and have never had a heat issue. I had a HP Netbook before this that was quite nice to set on my lap on really cold nights, but the MBA just does not kick out the heat.
if you watch any flash streams online and use it in bed, the fan will blast and it'll get warm (this is with the base 13" 2011). I suppose this is good in the winter but it could be annoying when its warmer.