There are a couple of Android programs that are so brilliant and well done that you can't imagine your life without them. For me, these programs are Launcher Pro, Titanium Backup, and QuickDesk. QuickDesk is ingenious and always makes those who see it for the first time beg me to tell them what it is. Minutes ago, Faruq, the QuickDesk developer, published a completely redesigned and long awaited version 0.4 to the Market, and it is good. Damn good.
To give you a brief background on the app, with QuickDesk, you double tap on the Home button and a quick overlay pops up on top of the current app without taking over and destroying whatever is going on on the screen.