2011: When cloud computing shook the data center
If I had to sum up in one word the most exciting thing that happened to cloud computing in 2011, I’d have to say it’s OpenStack [1]. This open source project, launched by Rackspace [2] and NASA in late 2010, is assembling a private cloud [3] "operating system" for the data center that promises vast increases in operational efficiency. The momentum behind it is phenomenal; at last count, 144 companies back the project, including Cisco, Citrix, Dell, HP, and Intel.
But at the same time, the public cloud is surging — and not just Amazon and Salesforce, though those two remain the largest public cloud service providers. The telcos (notably Verizon) are gearing up to deliver IaaS (infrastructure as a service) at a larger scale than ever before. Microsoft, HP, and others are also building out huge public cloud capacities…

