The Cydia Store launched its first product on March 07, 2009. Cyntact sold sells for a buck, and was the first paid package through the Cydia Store. It allows you to see profile pictures in contact lists. While not the only 3rd party application store for the iPhone (Rock Your Phone also exists), the Cydia Store is definitely the most popular one, largely due to Cydia's immense popularity as the source for jailbreak packages (items you can only get when jailbroken - like themes and apps such as GV Mobile, recently kicked out of the AppStore).