Automated unit test generation/white box testing

Java:

Randoop

.Net:

Pex

Change your Windows desktop background automatically

Download Wallpaper Juggler

Let the software download wallpapers, or download from hiren.info, wallpaperstock.net, interfacelift.com

Other wallpaper sites: Social Wallpapering

Research papers online

Economics,

RePEc

EconPapers

National Bureau of Economic Research

Application Launchers

QuickSilver, granddaddy on Mac

Windows launchers:

DoMercury

SkyLight

WinSilver

Launchy