My first advise would be not to get too aroused by paper specs. Although they might seem to be great deals on paper (or screen

), it doesn't mean they offer the level of quality you would expect. That why I would recommend first to verify about customer support. I know many people overlook this aspect but don't make this mistake. Take the time to get informed on this point. If you happen to have defective parts, like Toshiba got me used to from my own experience with them in a corporate environment, you'll be glad you have checked this point out before making your choice.
Also, check about memory. Sony is using 2x256 which should leave no spare slot for future expansion, if any (not mentionned on their pdf). Toshiba doesn't specify the setup but since their 512MB module will only available in fall 2002, I assume the 512MB they provide also uses 2x256. If so, no expansion slot available to reach the 1GB supported.
Battery. Did i read correctly? 1.68 hours of battery life for the Toshiba? Sorry to say but, gosh, it sucks! If paper specs are that low, it means that under any above-normal-use (lot of disk swapping or cpu intensive apps) you'll get out of juice quicker than you can think of. Important thing to think about if you're a roaming type of user.
Heating. I would advise also to look for overheating problems. Also, it would be good to check where and how much heat is dissipated. I'm myseld a laptop user for the past few years and nothing is more annoying than feeling your thighs being toasted by heat dissipation when working elsewhere than on a desk
Weight. Both portables weight quite a bit. I currently have an Inspiron 8100 which weight around 7 pounds and it shows! If you plan to move a lot with your portable, you may want to consider the weight factor.
LCD/graphic quality. Not all LCD look the same. Check for any blur, lack of brightness/contrast, lack of crispness, etc. I currently have a 15.1" 1600x1200 LCD on my laptop but I don't find the brightness and contrast to be as high as it could have been, although quality wise, it is very crisp. Since 16" LCD is quite new, I would make sure it has been well designed. And don't take for granted that since it's a Sony, it is also s Sony LCD. Toshiba for example uses Fujitsu LCD in some of their laptops.
I would have some other thoughts to share but I think it's enough for now