Android was publicly announced on November 5, 2007, followed by the SDK release on November 12th, 2007. A few days later, HelloAndroid.com comes out with an Application Database, which could be considered the first Android catalog.
Around the same time, a couple other guys and I form SlideME, starting work on an application manager and portal for Android. We decide to enter the ADC I with our solution.
On March 20th, Sadko Mobile announces DroidStor, a commercial solution.