Ever since I plugged a secondary monitor into my computer for the first time, I've had a maxim: the more displays hooked up to your machine, the better. If you scoff, try it out: you would be amazed at what a difference additional real estate can have. You'll find yourself more comfortably multi-tasking, kenneling similar applications on distinct monitors: typing apps in the center, image manipulation apps to the right, with the most sinistral LCD constantly visualizing your iTunes playlist or playing an episode of Futurama.
I've always fancied adding another, smaller monitor to my current setup. I envisioned a tiny corral for my IM contacts window, a clock, an unread email counter, contained inside a display scarcely larger than a digital frame.
The MIMO display (Korea only, for now) seems like just the ticket. A small, 7" LCD that connects to your computer as an additional monitor via a spare USB port, the MIMO is surprisingly cheap.The basic, screen-only version is only $78, where as the more advanced UM-750 features a touchscreen, TV tuner and built-in webcam for only $147.
Keeping my fingers crossed that this hits the States... and by the time it does, it adds in Mac support.