While I’ve been at DEMOfall in San Diego, Intel has been holding its equally newsworthy Intel Developer Forum conference back in San Francisco. Today’s big announcement was the mobile version of the Core i7 quad-core CPU (code-named Clarksfield),as seen in such new laptops as Toshiba’s latest Qosmio. Laptop Magazine has benchmarked a Core i7 notebook provided to it by Intel, and found it to be smoking’ fast–but with iffy battery life. As usual, there’s a limit to the conclusions you can draw about a processor from tests of one computer–especially one supplied by the chipmaker in question. But as more machines ship from major manufacturers–including, eventually, Apple–expect some really powerful systems, starting at a relatively reasonable $1000 or so.