Google just announced that it is adding in-app payment support to Android.

This will allow developers to charge for upgrades, or add ons, within an app.

Apple has offered this for a while, and it's been great for developers. According to mobile analytics firm Distimo, half of developer revenue is now coming from in-app payments on iOS.

Bart Decrem, the man behind Tapulous was on stage to demo in-app payments, and it looked pretty smooth. He says Tapulous will be coming to Android, it was previously iPhone only.