Do you know Google? It is the most used search engine in the world!
Do you know W3C? They are defining xHTML and CSS standards.
Do you know Newbies Paradise? Of course you do, what a stupid question...
But have you ever heard of CSS Zen Garden? This website features nifty CSS designs. The xHTML file is always the same, but you can change the CSS file to customize the page!
Also, did you know there is a Google H4x0r version? It is not an easy language to read when you are not used to it, but you have to admit these guys are fun!