Google Nexus One: How to Quickly Access Your Recent Applications
Contributed by Rob Rogers 
Tagged: Android If you want to use an application that you recently used, instead of hunting for it via the Launch button, you can access the Recent Applications window and quickly access the application from there.
1. Go to the Home screen.
2. Longpress the Home key.
3. The Recent Applications window will appear.
Select the desired application or tap the Back key to exit the window.
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Don Rogers said on January 26, 2010
Okay genius, I was feeling a fool ever since I got my Droid coming through my app list to find what I had mistakenly closed. Thanks for the quick and dirty remedy!!!!!