Here's another one for the rumor mill: Nvidia, which got about $30 million from Sony for the PS3 graphics engine, has signed on with Sony for another product -- and Nvidia execs say the new deal will run through 2007, and should earn the company "slightly more" than the PS3 deal. So, what's it gonna be, rumor-mongers? PSP2? Vaio media center? A color Reader? For now, though, Nvidia is playing coy, boasting about the deal, but going all silent on the details.