Anyone here know how to center text properly using XHTML, or CSS with XHTML? I'm trying to do the whole website thing, and I want validated clean CSS and XHTML, without messy center tags that are apparently out dated, according to the w3 validation site. Thanks guys.

Not sure what you are wanting to do haxer, whether it is text or for including an image, but imagine this for a text sub-heading ~

CSS :
h2 {
text-align: center;
}

and as XHTML strict:
<h2 style="text-align: center">This is valid XHTML strict</h2>

If it is for an image, for CSS you should use the float property.

You should be able to find relevant code on the w3 pages ~ http://www.w3.org/Style/CSS/learning and you might also find this page useful ~ http://webdesign.about.com/od/htmltags/p/blatalign.htm

Mickeblue's got it right on the head

I'd like to add http://w3schools.com to the list as well.  This is pretty much how I learned all the technical stuff for web design.  Not only do they have the specs and reference material, but excellent examples.

For help with positioning and browser-specific bugs/hacks, I'd recommend http://www.positioniseverything.net/

As an aside: For another purpose (portfolio for an interested potential client) I've put up all my completed web-template projects in http://www.skinyourscreen.com/templates - the fun part for me was looking back on the original Skinyourscreen.com templates used in the past.  Perhaps I'll have to cycle 'em through again just for ol' times sake!

Awesome, thanks a lot guys. I knew I could count on y'all.