As Prabhakar Raghavan, Yahoo! Chief Strategy Officer and Head of Yahoo! Labs mentioned yesterday, Yahoo! Is focused on using technology like its C.O.R.E. System, which powers Yahoo!’s popular “Today Module” to personalize the Yahoo! Experience for hundreds of millions of people. Yahoo! Labs has a number of talented scientists working on the science of personalization, including Justin Rao, who is developing economic models and theories for understanding why personalization is so popular with users and how much choice users want in their digital media experience, among other topics. We interviewed Justin last week. Check it out: