When you create a new post, it's added to your FB Fan page. However the URL it uses is the default permalink (/?p=123) rather than a more SEO friendly one (as per settings for the website).
Another question; is this plugin supposed to combine comments posted on both the post and the Fanpage? It doesn't seem to be the case at the moment, although it would be ace if FB can include that. I seem to be getting quite a few comments on when they get posted to the Fan page, but not so many underneath the article.