Here is a list of some of the best CSS Button Generators available on the web. All of them have a nice, easy to use user interface that you can generator awesome button and get the CSS and HTML code for your button.
Most of these include some of the best new features of CSS3 such as shadows and border radius. If your browser supports this you can take advantage of these new features.
Button Maker - CSS Tricks
DaButton Factory
CSS3 Linear Gradient Buttons Generator
CSS3 Linear Gradient Buttons Generator
I2Style
