I was chatting with a CIO mate today about the future of cloud computing and how his company are looking to build their own Cloud Enabled Application Platform (CEAP). I feel that many companies are sensitive to putting their data in the cloud itself and my friend definitely echoed that sentiment. There are some things his enterprise could put in to the cloud for economic reasons, but most things will reside behind their firewall.
Interestingly my friend's main driver for a CEAP was to achieve horizontal scalability. He has some performance issues that lend themselves well to being addressed in a highly parallel manner.
During this conversation I used the term "low cloud" to describe CEAP hosted behind the enterprise firewall. So, you heard the term, "low cloud" here first. :-)