I have recently updated my blog with what I think is a better add layout. Please comment (pros/cons/etc) http://www.nissangtrproto.com/
I think the ads are well placed, but take a look at clickmap if you can and observe where your users click. Perhaps they focus on another part of your site... But you will probably get banned for "suggested links" above the ad unit in the center column. You ask people to support the sponsors, but to support them they need to click on the ads. I think Google wouldn't be happy with that.