Mobile communication startup Nimbuzz has just made the first native application for BlackBerry smartphones that allows for multi-network chat sessions available in Research In Motion's App World store (get it here ). The native functionality allows the free app to run in the background without interruption, have alert notifications ‘pushed’ to the BlackBerry device's home screen and match notifications with the phone's sound profiles. The program is first-generation, and Nimbuzz promises more features are forthcoming.