Photography: Improve Your Digital Photo In 1 Second

cant see?

If you use google's picasa, then you can do them same thing, but a little bit better by pressing "I'm Feeling Lucky"

It is a 1 second technique, but it's for overexposed photos. You can also press Ctrl+L to open the Levels tool and move the middle input slider towards the right instead.

That's another way to do it indeed. But if you press Ctrl+L it applies to the image and you can't adjust the levels later. Ofcourse you can go step(s) back but I rather use a Levels adjustment layer, this will give you the option to adjust the levels or any other adjustment layer for that matter.