Hi Tom -

How have the changes helped your site?

You'd asked about improving your Adsense earnings. I recently listened to an Adsense webinar from David Risley and he recommends moving the sidebar with Adsesne ads to the left instead of the right. Also put your best performing ads at the top of the code. So instead of the horizontal links use one of the larger boxes which have been proven to have better clickthrough.

Pat Flynn recommends this Adsense plugin for wordpress.