Cooled by a portable 5,000-BTU window air conditioner (heatsink not included).
Read more carefully, these processors are far more efficient than before. The Pentium D was an energy hog, it was terrible, the new Core2Duo can even run with passive heatsinks, if you clock them down, where you STILL get alot of CPU power.
This is all thanks to that little Intel "skunworks" lab which developed the Pentium M processor. Those guys SAVED Intel. Thanks to those smarty pants over in the country of Israel.
Since it is based on the laptop processors, it is going to be cooler than the P4. Of course, the sun is somewhat cooler than a Prescott.
It's still a good thing for Intel and the industry as a whole. Computer speed has been plateaued for some time.