A couple of observations --
You said that you want firewire / usb / wireless / external VGA. The Sony has built-in firewire (4 wire variety), an the Toshiba has built-in mini-PCI card wireless (I think you have to use a PC Card to get wireless with the Sony). They both have two USB ports, but the spec is 1.1, not 2. This is fast enough to burn a CD in a little less than 20 minutes, but the performance won't blow you away if you attach a hard drive this way.
So, to get the connections you want you have to buy a PC Card wireless client for the Sony, or you have to buy a firewire PC Card for the Toshiba. Both of them require the use of adapters (or "dongles") for connection to external monitors.
Both systems use Crusoe processors. These will not blow you away, speed-wise. Their performance is, well, relaxed. The slower performance (a little slower than the 500 MHz PIII Mobility in my Inspiron, for instance) of the processor coupled with the typical slowness of a notebook hard drive means that you will need to be fairly patient.
I can't say anything about the quality of the Sony. I haven't seen one. My experience with Sony equipment has been pretty good, however.
I happen to own one of the Libretto L5s, and I absolutely adore it. It is put together like a little Swiss watch, and it has a wonderful feel to the keyboard even though it is pretty darned small for my big hands. I can type very, very rapidly and accurately using this keyboard. The unit's case is magnesium alloy, and it has a much more solid feel to it than the other tiny notebooks I've had a chance to handle. The aspect ratio of the screen (1280x600) is a bit odd, and it has taken some time to get used to it. It wouldn't be my first choice for graphics editing because of the size and shape of it, but it is absolutely the finest quality LCD I have ever seen, and the ATI graphics subsystem has performed flawlessly. I can read tiny text on it for many hours without suffering any eye strain whatsoever. The unit is also extremely quiet, making it an excellent choice and good companion no matter where you take it. It doesn't whine and whir like my huge Dell Inspiron 7500 does. And it hardly gets warm to the touch. I got mine with the external bootable CD-ROM drive and 512 MB RAM. The bootable external CD drive does NOT boot a Windows XP setup CD. It's limited, apparently, to DOS. That means that you have to do some jumping through hoops in order to install anything other than the restore CD version of the OS. I'm working with Dynamism.com's tech support people on this matter right now.
I have always carried great whacking big notebooks / laptops / portables and have always chided other people who whined about weight and size. The fact is, though, that it's nice to carry something this tiny around. It is a little slow, but I find the trade-off of speed in exchange for the unobtrusiveness to be worthwhile. In other words, I didn't need a little notebook because I have no problem carrying 50 pounds of computer gear around with me all day. I've done it for decades, and it just seems okay to me. But I didn't realize how nice it might be to have a notebook that doesn't take up so much space between myself and other people in conference rooms and on airplanes and trains and in the park. This thing is truly cool.
Your links point to Dynamism.com, and I think you're definitely on the right track there. The tech support staff has been superb so far. If the cost isn't too much of an object ask them about an extended warranty. To get one of these puppies repaired you will have to send it to them, and they will have to send it to Japan, and so on! It appears that they can manage a pretty quick turn-around on this, but you don't want to be stuck with a computer that the parent company doesn't officially support on this continent. And, while you're at it, get it insured for theft and damage. Insurance is cheap. These things are LITTLE. My Libretto would fit easily into many purses or overcoat pockets.
Do remember that sub-notebooks like these require you to carry about a lot of external gadgetry if you want to be able to back up your data on the road or install software or whatever. I probably don't actually save a lot of weight overall by having this tiny thing. But it is very comfortable to use in crowded places and in places where it would now seem really rude to open a notebook with a 15" or larger screen, thus partitioning myself off from the rest of the world.
Good luck!
- prosaic