If you haven’t seen the numbers for the Android App Marketplace, let me spare you the time — they are disappointing, highly. I can’t speak for myself, because I haven’t bothered to push anything paid into the app marketplace, but why would anyone, especially after the Larva Labs post about how their top selling app was making a total of $64 a day!

That being said, the credit to the iPhone’s success is definitely iTunes. You have credit card info already on file, and you’r offering tons of multimedia options to your customers means they are already downloading and buying things all the time anyway.

Obviously with 81+ million iPhone/iPod/iPad devices, and over half the smart-phone ads from AdMob being served to the iPhone, it only makes since that developers on the Apple platform make more money. But, according to AdMob’s Mobile Metrics, Android is catching up. Increasing their ad delivery by 22%, growing from 2% in Feb. ‘09 to 24% in Feb ‘10; thats still less than half the iPhone’s 50% ad delivery rate. (This growth is highly due to the Motorola Droid – FYI.)

The smartest move for Google right now? Buy DoubleTwist. It’s already been touted as “iTunes for Android“, which may seem like a joke due to Google’s web presence, which is pathetic.

DoubleTwist has the makings of a very good courting to Android customer – it has music from Amazon, it tossed DMCA out the window, and gives you a very sleek interface to do everything with. Obviously the only glitch right now is that you can’t actually download Android apps in DoubleTwist just yet; which Google could easily fix if they acquired DoubleTwist.