If you’re still looking to insert ads into your Android app, Google just released a new guide, the No-Nonsense Guide to In-App Ads.
Now, I admit I haven’t read it yet, but I’m pretty confident you’ll get good value from your money (it’s free) and Google/Admob can afford to put money into a good guide (because they make so much money they don’t have to worry you’ll take the info and run).
I’ve enjoyed the other free design and marketing-related publications lately from Google, and they’ve been high quality, so check it out.