Better Drop Shadows in Photoshop | Design Reviver
http://designreviver.com/articles/better-drop-shadows-in-photoshop/
Owltastic — by Meagan Fisher
http://owltastic.com/2009/12/shadows-and-css3/

Shadows and CSS3

Text Shadows

I’m currently working on a design that uses text-shadow and box-shadow, with RGBA in place to create the shadow color. I wanted to tweet about this technique because it’s simple and awesome, but to my surprise I couldn’t find a good, quick tutorial that covered the use of both text and box-shadow, along with RGBA. So I decided to create one.

how to use CSS3 to create drop shadows

Como aplicar sombras con CSS en TODOS los navegadores web.

"One of the most common CSS effects is using shadows in various ways. Before, we needed to resort to images, but now we can offer this to all major web browser with CSS!"