I have had my blog for over a week, and have written many articles, and my site has been crawled many times, but there are still no Adsense ads showing up, only the public service ads still. What could be the problem? http://xbox360connection.blogspot.com/
They show Public Service Ads when there isn't any suitable Ads to show... If you are seeing Public Service Ads, it doesn't mean other are seeing them too.. Most likely visitors will be seeing normal ads.
I'm still seeing PSAs for your site. Did you check to make sure that google has a lot of pages in it's index? Mine was still showing PSAs after it had indexed the index page and nothing else. It could also be that there are no relevant keywords for google to display ads for.