Lately, pretty cool things happen in the world of web design. HTML5 and CSS3 very easily get under the skin of everyone who is involved in the web development in any way. Although, all of these stuff aren't that revolutionary and have been around for a while in the computer designing, yet the possibility to create color gradients, box and text shadows, and even transitions and animations by the use of simple text code simply can't leave you indifferent. The good news is that most of the browsers available throughout the wide range of modern electronic devices already accept and are capable of presenting these new HTML and CSS features. The bad news is that HTML5 and CSS3 aren't standards yet, and we'll have to wait for a (pretty long) while until they get out of the W3C working drafts and become a de facto standards.
But, who needs to wait when all of these goodies are already available. The webkit based Safari and Chrome, along with the always ambition Firefox have made it possible for most of the new HTML and CSS features, Opera also keeps up the pace in a decent manner (it doesn't support background gradients at the time of writing this post), and suprisingly, the latest versions of Internet Explorer seem to make great efforts in order to join the club -- they have a long way to go, meanwhile there are plenty of workarounds, not as cool and elegant as a simple line of code, but if you really care for it and it makes a difference for your design and visitors you can do it.
The application is pretty easy to use (it should be), so go ahead and give it a try!