Ultralight?

Hi,

I'm looking for an ultralight for business use. I travel a lot, so the smaller the better, but it feels like I have to compromise performance if I get something tinier. I'm trying to decide between the Fujitsu Lifebook Q2010 and the Sony VAIO VGN-TXN15P.

I like the Fujitsu because it's the smallest but still has a great screen. I like the Sony because it's got the optical drive. Anyone have any positive or negative experiences with either of these? Or suggestions on other ultralight systems that are good?