Wordpress.com Adsense
Accepts adsense Wordpress.com?
If you ask if you can put AdSense ads on a blog WordPress.com, the answer is no. This is because Adsense scripts that are coded in JavaScript, you can not add Javascript to a blog WordPress.com. If you want a blog that can run Adsense, you need a blog WordPress.org. This is a blog that you host on your own domain. See this article that explains more:
Tips on How to Upgrade WordPress Blog to v2.9
