Getting better ad serving with a blog

blog format

[pcmike]

I run a couple of blog-type sites with lots of updates through the day.
The ads delivered by Google are close but tend not to be as precise as they should. I'm wondering if I need to mess with the meta tags more or use one of those robot index, follow commands. I keep posts from about 12 days up on the main index page, with the most recent posts always at the top of the main center column (it's a 3-col layout).
Anyone have any suggestions? I'd just like the ads to better key in on the subject of my posts.

[WebRankInfo]

MediaPartner, the GoogleBot that comes to index your pages with AdSense ads, comes to index the pages that humans have previously viewed.
I don't think that the meta robot would change anything.
Maybe the themes of your last posts are too different?

[Blue_Fin]

It has previously been reported here that new pages are crawled very quickly, within minutes to a few hours, whereas existing pages that are updated are not recrawled for days or even more than a week.

If your pages only have 12 days of comments, you'll likely never receive the optimal ads based on the most current ones if it does work this way.