Research In Motion announced today the joining of The Astonishing Tribe, or TAT, to their team. TAT has been involved in many mobile user interface designs, such as the original Android UI on the T-Mobile G1, and will be lending their artistry to the BlackBerry PlayBook and RIM's smartphone platforms. What does this mean for BlackBerry users? Well, judging by TAT’s previous design efforts they’re going to be some happy BBMers.