Until you can find a way to cool a laptop CPU passively, you're going to need airflow, so sealing the case is out.<p>Although building the platform on ARM (as we presume the Tablet to be) probably fixes that by simply not using a laptop CPU. Not to say that you can't have a passively-cooled x86 system, but are any of the new integrated platforms cool enough for that? Given the power you can get with ARM SOCs these days, it may not matter.