As part of my ongoing Adsense experiment and trying to get the right ads to show I’ve tried another technique.  Good SEO says that you should always add an "alt" tag to your web graphics and again, I don’t know the algorithms of the Google AdBot, but putting a lot more graphics with alt tags has definitely improved the relevancy of the ads.

You can also use what Google call "section targeting" by removing sections of content that you don’t think are highly relevant.  By adding tags:

<!– google_ad_section_start –>

<!– google_ad_section_end –>

in your html code, you can decide which parts of the content you want Google Adsense to see.  There is a whole section on Google Adsense section targeting here:

Google Adsense section targeting

Check back for Part 3 of Adsense Relevancy