Ok so on my site http://exaro.org, it's a flash game listing. At first I had a main page that had sort of a news posts with recently added games, some links, and a joke. But I found the ads that were being shown weren't too relative to my material. If you look now I took out a few pages and just made the full game listing the main site. Do you think this is anymore effective than if I had an "whats new" main page, as opposed to the current "game listing" main page? EDIT: Link fixed, its in my sig anyhow.
In my experience if Googs doesn't have a lot to go on (which seems to be the case with your page) it'll go with the title and the meta tags. I've found this to be the case with my pictures gallery. I have an image, alt texts, and captions, but I find that the ads are usually relevant to my meta tags only.
Yeah for now the main page still has ads about "grass" because the article I used to have posted, used to have a few paragraphs of a joke that had grass and lawn in there a few times. I wonder when they will change from that