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The banner feature is designed around intergration with external ad managers such as PHPAdsNew. You can just dump the banner code in the banner area, and then use AMS to control what benners are shown where on a topic, sub topic and article level. It also has an inheritance option so that what ever banner you set at the topic or sub topic level flows down to all sub topics and articles that exist underneth that point. Not a complete banner management system by any means, the aim was just to make the intergration a little more streamlined.
The audience feature is one of my favourites, and it is where I can see a nice marriage between xDonations and AMS. When you submit and article you have to select an audience level, and only those members of the groups with permissions to that audinence level are able to view the entire article. Otherwise you are only able to view the scoop/description section of the article. So for instance if you have a load of articles you want to setup on a pay for view system you could set the audience level so that only a donors group has full access to it in AMS, and then setup xDonations to add x user to x group upon donation at which point they could then read the articles.