Twitter Analytics Coming Soon

According to Mashable, Twitter is going to launch a free analytics tool at the end of 2010. Sounds like it could help some companies figure out how to use Twitter as a marketing tool. What tweets make people "unfollow" them? What tweets do people like the most? Who actively engages with their tweets? Identifying those active individuals could help them identify brand ambassadors to spread the word about their products. A free analytics tool may also nudge some companies to join the Twitter fray who have been hesitant in the past.