I just launched my first 2 apps in the Android Market today (a DJ application called DJPad, currently only for tablets, free and paid versions). DJPad's been in the WebOS app store for about a month so I was planning on doing a similar income report for my first month (spoiler: not great ;) )
Have you looked at all at Airpush's advertising platform? I google'd Admob and it came up as an ad on the search results. It was easier for me to implement Airpush at this point since my app is 100% NDK with just a Java wrapper for launching it. Integrating Airpush was just adding the airpush library and launching the service in my onCreate().
They offer some interesting advertising verticals like ads showing up on the notification screen or home page instead of in the app. Kinda spammy but probably effective if you want to advertise and your app does not get long engagement.