Google yesterday launched In-app Billing on the Android Market. This feature enables developers to publish apps that use in-app Billing and users can make purchages from within the Android apps.
Android Market In-app Billing is an Android Market service that lets you sell digital content in your applications. You can use the service to sell a wide range of content, including downloadable content such as media files or photos, and virtual content such as game levels or potions. [Source]
In-app Billing enables developers to bring a lot of new apps on the market. I will definitely have a look at it more deeply.
[via Android Developers]