1. The top of the page ad should be set to text only; the current setting does not serve you at all; take my advice and change it to display only text ads. 2. The link unit beneath your first AdSense ad should be placed beneath the login field and above the forum section. 3. Your third ad is placed too low on the page; it should go between the most accessed sections of your forum; you could leave this as it is or change it also to text only. It should go a little more upwards on the page. 4. You may consider lowering your first ad also; There are fewer chances to get any clicks there. 5. You may set up channels for each of your AdSense ad units and see which perform better over a one month period. Good luck!