I just do it because when you work with CSS and only use your (x)html files to present data you get A) A much nicer code and B) a much more flexible code.

For example, if you want to create a new skin, instead of going around and changing every html file you have, just mess with the few CSS files you have made. It's just... Smarter. I guess.

I'm also used to it... But all that "HTML sucks" and "if you can't code XHTML you suck" hype is idiotic. It's like those Linux users that bash Microsoft for every tiny little thing... I'm a Linux user myself, as I'm an XHTML coder, but every thing has its advantages/disadvantages. Linux is faster, more scalable, etc, and Windows (with the help of brilliant marketing) supports more programs. Just as XHTML is faster and more scalable, HTML is fully supported by many browsers and just works, 99.99% of the time.