The most familiar examples of cloud computing are big, publicly available, Web-based applications such as Gmail and Google Docs. But given concerns about security and reliability, few big companies are ready to entrust their IT operations to publicly shared infrastructure, even if it’s cheaper. Large companies are creating private clouds by shifting their internal computer power and applications off the PC desktop and onto shared infrastructure, where employees use it only as needed. “These large, enterprise organizations have the economies of scale to deliver the same thing as [public clouds]. Oracle (ORCL) founder Larry Ellison prefers to call it “fashion driven” computing or “complete gibberish.”