360desktop
Surprisingly, there's a lot more than screensaver snake-oil here. When you run 360desktop, you get a panoramic desktop with custom widgets. Quit, and you're back to basic Windows. Switching between the two didn't cause problems when tested, although quitting 360desktop completely required killing the process a few times.
Web widgets are simple to install and work well. Click "Add a widget" in the QuickNav and you'll see a bare-bones dialog with two tabs--Web Widget or Embed Code Widget. The first lets you enter a widget name and a URL, while the second lets you enter a name and a snippet of HTML code. A special 360desktop toolbar appears next a new widget from which you can drag-and-drop the widget, close it, or click the "i" button for more information.
The public beta of 360desktop makes some intriguing promises. "Unlimited desktop space" is one, and the capability to save any part of the Web directly to your desktop is another. Windows programs and doesn't seem to affect any critical system files, although it does place a shortcut on your regular Windows desktop without asking. It's not essential software, but if you've got the RAM to handle it.
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