Thanks zoleytaylor for the tip, and Jim for improving the aqua button by rewriting it with box-shadow:inset. Now it is really semantic!
My bad. I edited the supported browsers for the new button. The inset value for box-shadow is not yet supported on Apple Safari4.
Re-written by Jim, making it more semantic by using box-shadow inset and removing "glare" div.
Will add on my blog soon!
Added support for Mozilla.
Now Mozilla supports the CSS gradient but the implementation is different from that of WebKit. For more info, visit Moz Hacks.
GirlieMac! Blog - CSS3 Aqua Button - Revisited for Firefox 3.6
Working as expected on Chrome4.
Almost working perfectly on Chromium for Ubuntu.
The first demo, only for Webkit Nightly and Safari4.
GirlieMac! Blog - CSS3 Gradients: No Image Aqua Button