The DIV tag is a great way of organizing your page.  It is a newer way of organizing information than using tables.  Many of the same attributes of the body tag will work on the div tag.

Here are some links on the <div></div> tag. Use them to control the style and set off parts of your design.

http://webdesign.about.com/cs/htmltags/a/aa011000a.htm

http://www.w3schools.com/tags/tag_DIV.asp

http://www.tizag.com/htmlT/htmldiv.php

http://www.yourhtmlsource.com/stylesheets/csslayout.html