I'd look at a
Lenovo X61.
They weigh about 1.5kg and have 12" screens. They *do not* have internal DVD burners. The last ones I deployed, I gave out with 8GB thumb drives, which cost quite a bit less than the Ultrabase that those things need to have their "internal" DVD drive. A T61 (I own two of them) weighs a little over 2kg with a 6 cell battery and one of the smaller screens... which are still at least 14" and therefore out of spec.
You could also look at a Latitude D430, which meets your criteria. None of HP's notebooks match your criteria, as their new models are still PATA-based and their old ones appear to have older Core Duo CPUs in them.
Apple is supposed to have a subnotebook coming soon as well. Apple notebooks are made by Asus, so it's likely that Asus will have a branded and very possibly an unbranded version of the same product later in the year.
Lenovo, Dell and HP have the only business notebooks I'd even consider purchasing (and a note to Tannin: HP's business notebooks are considerably nicer than their vomit boxes. They also cost even more than Thinkpads do).