I really question companies that make such things as this Vaio PCG-U1 or the OQO.
Why? Because it's like the cube. It's not solving a problem.
When I want a full-featured device can do as much as a regular PC, I go with a laptop. I don't want something abnormally small that I have to touch-type with my FRICKIN' THUMBS!!! And I don't want to have to strain my eyes to see 5-point type, or have my screen limited to something like 10 lines of text! Furthermore, things like this are limited because of their size, so you can't pack as many features as, say, the PowerBook G4. Get a slot-loading combo drive, an Airport card, a hard drive, 1 gig of memory, a PCMCIA slot, speakers, a large screen and a 5-hour battery in that thing, and then maybe I'll buy it.... oh, wait, then it'll just be like the PowerBook G4.
Seriously, if I want a full-featured PC, I'LL BUY A FRICKIN' LAPTOP! If I want mobility with all the features, I want a LAPTOP, not some weird PDA/Laptop combo that combines the best of both worlds to make a worse product. When you combine the size of a PDA with the power of a PC, you get something that doesn't work.
Conversely, if I want something small that I can put in my pocket but has organizational capabilities and small games and stuff, I'll get a PDA, not this thing! I don't want Windows XP cluttering up my screen when it's totally unnecessary. Seriously, I wonder how much of the screen the Start menu will take up probably half of it. Even something like the Classic Mac OS or Mac OS X would unnecessarily clutter up a small screen like that. Furthermore, the size limits the feasibility of the keyboard and the trackpad, as well as tossing things like speakers to the wind. It just doesn't make sense to have a full featured operating system on something as small as that.
Seriously, people, would you REALLY need something like that? What, you want to play games on something as small as that? Hahaha, right. Oh, you want to browse the web? Good luck on that small screen. You want to listen to music or watch movies? Heh, I'll stick to my iPod and an iBook/TiBook with its larger screen. If you're going to use it for something like organization, I'll stick to a Visor/Palm/Newton, which can do the same stuff.
I don't get how companies think that they should just follow the trend. When they see laptops getting smaller and smaller and lighter and lighter, companies think that they should just keep making laptops smaller and lighter beyond the feasibility point. Same with things like cell phones and stuff. They keep getting more complicated and add things like instant messaging I wouldn't instant message on something like a cell phone in my LIFE!
If things like this catch on, I'll be shaking my head. The only thing it will do is make people have to squint more and to hunch over more. Seriously, that's it. Devices like this are so d*** stupid.
End of rant.