Ok, first thing you need is GoogleAdWrap from:
Google Ad Wrap - Section Targeting | Urban Giraffe
Next, you need to review the results here for Robots.txt & Wordpress stuff:
Google
One more thing: If you edit your template, and place the Google tags:
<!-- google_ad_section_start(weight=ignore) -->
<!-- google_ad_section_end -->
around any text in the template that is BLOG related, it will help. This includes wrapping the comment around the links to the archives, the footer text, anything with WordPress-type stuff in it. It will not effect anything OTHER THAN how Google views your page.
Oh yea, also wrap your meta info that may contain anything WP related too...
Just make sure you keep the spacing EXACTLY as it is. I have read where it was not working, but after fixing spacing, it worked fine.
I was getting WordPress/Blog ads all the time till I did this and it helped a lot!
Good luck!