I've occasionally used a mobile app to post from my phone. I didn't use it enough to justify buying the free version and didn't mind seeing ads while actually using it.
Lately I've been getting ads in my notification area. That's where I get information about phone updates, news, weather alerts, & messages from my wife and bosses. Blogger Droid uses something called Air Push to create these intrusive ads. I uninstalled the app and will not be purchasing the full version because I don't want to encourage this irritating practice. So now I'm using the official Blogger app.
There is also an app called Air Push Detector to eliminate apps that use this obnoxious software (especially since they design it to make it difficult to know which app is causing the ads). http://www.androidpit.com/en/android/market/apps/app/com.brosmike.airpushdetector/AirPush-Detector