The developers behind the iPhone game Angry Birds certainly have something to smile about this morning. Chillingo has announced that sales of the title have totaled more than 500,000 in less than a month.

Developed by Rovio Mobile and published under Chillingo’s Clickgamer brand, the success of Angry Birds serves as a prime example of why smaller developers often seek the aid of larger publishers to promote their games.

“Chillingo is really the App Store kingmaker,” said Mikael Hed, CEO of Rovio. “No other company has managed to repeatedly raise previously unknown titles to the top of the App Store charts, making them into leading game brands as they have done with Angry Birds.”

Angry Birds is available for only 99 cents from the App Store. Thinking of picking it up? Be sure to read our review to see if it’s right for you.