PowerPlay is indeed the term. See a good explanation of it here:http://www.anandtech.com/mobile/showdoc.html?i=1692&p=5
Since I don't have my new 5660 yet, I don't know if the stock drivers have PowerPlay enabled, but from what I have read, not many notebooks have the hardware/software enabled for PowerPlay yet. A shame really as this feature would make the Sager's a killer machine - raw power and better battery life too, if configured correctly using PowerPlay.
I would hope Sager has the hardware support for this already on the motherboards of the shipping units now and all it would take is driver support later, but my inside info says no. I hope they are wrong.
If anyone has any corrections to this, please post here.