Kuroutoshikou USB Video Card
You know Buffalo, the wireless networking device manufacturer? Yeah, their sister company Kuroutoshikou has made a pair of USB connected graphics cards. One has a VGA connector, the other DVI.
They offer up output resolutions of 1440x900 (WXGA+) or 1280x1024 (SXGA) all through a USB 2.0 port. Other than the USB 2.0 port, all you need is a minimum of 1.2GHz P3 processor and a half gig of RAM.
Or, if you want to, you can use up to 6 of them, the hardware requirements are a bit stricter for that though, requiring a minimum of 1.6GHz Core Duo processor and a full gigabyte of RAM, but you do get 6 freakin screens of whatever you want to display. They are compatible with XP and Vista only right now, but no Aero effects if you use them. Furthermore, they can only be had in Japan, but they are fair priced running between 60 and 80 Euro or about 9-12 thousand Yen, and should be available later this month.
USB WXGA+/SXGA video card from Kuroutoshikou [via akihabranews]