In “The NIST Definition of Cloud Computing,” Peter Mell and Timothy Grace point out that there are four types of clouds: Private, public, community, and a hybrid mix of at least two of these. If you are thinking “What is a community cloud?” then I encourage you to go back and read the NIST paper. It’s really short and succinct, and your personal cloud vocabulary will be better for it. The vast majority of business will end up using their own private clouds and interfacing with various public cloud offerings from their partners. Availability seems to fit just perfectly as a hybrid cloud opportunity.