The Compass CSS3 uber button
This button style works for a div, an inline-block, and a button as well. uberbutton is for a dark button with white text, uberbutton2 is for a light button with dark text. Just give them gradient colors to obtain your sweet button!
Here’s how it looks like:
As an added bonus, if you use CSS3PIE, you get the gradient and rounded corners on IE as well with almost no work!