I’ve added a small page that lists the Intel Core Duo-powered ultraportables here. Right now, the only “officially” announced ultraportables are from ASUS, Lenovo, and Toshiba. More Core Duo laptops should start showing up very soon, as some companies are simply taking existing laptops and swapping out the systemboards.
I had a chance to look at the Sony Duo Core offerings, and their 13-inch widescreen laptops were so lightweight (under 3lbs with the Carbon Fiber case) and with the widescreen, they are actually close to, if not smaller than many 12-inch ultraportables, so I’m going to start listing those later this week. If you’ve handled one, you know what I’m talking about. I do look forward to Sony’s 11-inch Duo Core offerings, but no word on those (yet).