Back at WWDC 09 when Apple started talking about iPhone OS 3.0 and the App store they announced a new feature called In-app purchases. They also made it clear that In-app purchases was for PAID apps (apps that cost money) and that free apps are going to stay free.

According to Wired.com, “Apple on Thursday sent e-mails to developers stating in-app purchases are now permitted in free apps.” So now you can for example download a free app, test out the interface and if you like it buy the full app right from inside the application.

This should make some developers happy! What do you think?