Here's mine now I have my new toy
Not hugely steamy apart from the lovely victorian wallpaper. Mac OSX Leopard with selected Dashboard Widgets on permenant display courtesy of the "Dashboard Developer Mode" hack. The pale grey square in the top right hand corner of the screenshot is "dead space" caused by the screens being a different size to one another.

Just noticeable is the fact that the two screens have different wallpapers.
Main screen is at 1920x1200, and I make heavy use of OSX "Spaces" to segregate applications - this is my "Web Surfing" space for instance.
Secondary screen displaying currently open chat window and selected most-used widgets is 800x480 (this is so that when I'm using Lightroom or another app full screen I can still keep abreast of what's going on in chat). Apart from the chat window, all are Dashboard Widgets - Nixie tube clock, calculator, system monitor, itunes controller, google search-bar.
800x480?
Yup it's a weird (and tiny resolution), but that's because it's a secondary 7" widescreen monitor, connected via USB. One of these in fact:
Nanovision Mimo UM-710 - And very nifty it is too. USB only connection to the Mac, uses the DisplayLink drivers. Can be rotated to portrait mode (480x800) but I prefer landscape, and it works as an extension of the mac desktop.

Drivers are also available for you poor souls who have Windows

so you too can add up to 6 other screens to your PC via USB.