I can't believe they didn't mention prefetch from XP, they sold the same thing already once before, maybe now it will work like advertized. And what happens to that collected data when you upgrade specific software, are the stats restarted for those new pages. For example I upgrade the Firefox almost every day with nightly releases, will it have any benefit from prefetch if it thinks that it's different app every day...they probably thought on that but that reporter should have asked him.