Mahusay theme is free premium wordpress theme with 3 columns and features: Tested on Latest WordPress version, 3 columns, widget ready, gravatar enable, adsense enable, ads ready, Valid CSS, Valid XHtml, Fixed width, Cross browser compatible with Internet Explorer, FireFox, Opera.
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I use this theme on my website http://www.ukwildlifewatching.com and find it to be very easy to edit, my only issue is the right hand nav does not display the hierarchy but all of the categories.