I use low drop shadows on almost every element on a page, just to give it texture. When I first started, I left them on their default setting in PSE, which is like 20/20/70. All my stuff looked like it was floating up off the page, so I heeded Jessica Sprague's advice to try to make them "realistic," so I usually go with 10/10/40 or 5/5/20, depending on the effect I want. It's all up to you!
Sarah
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