Pretty nice...
If you care for that right margin -the lighter gradient, then set one more on the left. So, the main section would be centered between two symmetrical divs.
Another thought is to try a fluid layout for the main section, and get rid of the margin at all...
Not to mention some (at first sight-) overlapping attributes (ex:<H2> <A>, see: ...<A href="http://www.swgreekz.com/requests/index.html">requests...), and a font closing tag which wasn't open, and may be others...
Well, and off the record, is it any worth while this endevour, or you count on the Adsense only?!
Anyway, scuze me for daring... Best luck!