Now that we've got the rest of the page styled, you can add in the footer. I just use a last div with a "footer" id, and add content so that you can see it. I also added a border on the top, so you'll know where it starts.
The HTML:
<div id="footer"><p>Copyright © 2008 </p></div>The CSS:
#container #footer {
float: left;
width: 870px;
border-top: #c00 solid 3px;
}