The layout doesnt seem to be aligned in centre, seems more aligned to left.. here is the screenshot that i am seeing http://i34.tinypic.com/21etf1d.gif
also i would advise you to move the links in menu bar of "home" , "edit browser" etc. to the footer and instead put an adsense link unit..you CTR will increase. also move the URL bar above the 336x280 ads..but below the text..and put a link unit both above and below the URL bar..
I made such changes in my proxy and my earning increased..Hope it helps..
And yes, write a unique text..