Right now Core duo is only out or mobile computers. It has the 65nm manufactuing process. Pent D is the 90nm and also dual core. Much more powerfull at the moment. And its also only for Desktops. Although Core duo is comming out later for desktops. I also forgot to tell you that Core duo saves major power when running in a moble. And you need all the battery power you can in a lappy.