Is it possible to have a fixed width header and middle sections, but a fluid width footer?
I tried setting the layout to 100%, then adding the below, but it doesn't work:

#header
{
	width: 930px !important;
	margin: 0 auto !important;
}
#middle
{
	width: 930px !important;
	margin: 0 auto !important;
}

See http://www.rmebuilders.com

Wordpress 3.4.1
Atahualpa 3.7.7

The way that site did it and the way I would suggest is to use a background image for the footer and set your site to the width you want in the theme options.

If you look at the code for that site footer in Firebug you will see how they did it.