I think it was over at TUAW where I saw this tip posted not long ago, I certainly realized that you can press the oblong button at the top right of a window to show/hide detail at the top of a window. What I didn't realize is that this is a great tip for installing applications faster, from a mounted DMG file.

By pressing the oval on a DMG install window, it will allow you to see all your drives and quick access locations, making it super easy to drag the application onto your Applications folder. Some developers show your Applications folder on the DMG window, but many don't and this is a great tip to make it easier for those instances.

I put together a quick video to demonstrate. Click here to see the video.