CSS3 (and some early browser-specific variants) support drop shadows. I found this awesome article that tells you how to create CSS drop shadows, and even gives the CSS code, so you can just copy/paste and adjust the numbers as needed. It works great. Scroll down a ways for the pre-written CSS to copy/paste.

Tevya

Hi, I'm Tevya! I wrote this. I am the owner of WordXpress and also created Starfish Plugins. I love helping small businesses and WordPress professionals. My wife Jill, helps with the business and is the amazing CEO of our family (3.5 kids). When I'm not working, I like to play basketball, go boating, shoot targets, swim, serve in my church, play Ultimate, and have outdoor adventures as a family.