Rackspace, the San Antanio based Cloud Infrastructure provider, announced on tuesday that their profits for the fourth quarter has surged by 32%, increasing from rom $6.8 million to $9 million. Rackspace, which was started in 1998, claims to have 70,000 customers now with over 51,000 cloud computing customers. Even though it is not clear how they arrived at this number, I would assume this includes a large chunk of Mosso customers, many of whom were from their shared hosting category. Even without any breakdown, it is easy to see the success of Rackspace’s cloud division. Cloud computing now accounts for roughly 9 percent of the company’s total revenue, but that’s expected to grow to about 14 percent this year, according to Tier 1 Research. By 2012, Tier 1 Research estimates Rackspace’s cloud computing business will generate $272 million in revenue.

