From time to time we link videos from vendors that offers insight into their thinking on various cloud computing related topics. Here is a video from Rackspace on Private Clouds.
Krishnan Subramanian
Research Analyst And Editor
Krish is an analyst and researcher focussed on high impact topics in the areas such as Cloud Computing, Open Source and the interface between them. Krish also evangelizes Open Source and Cloud Computing on various media outlets, public speaking and blogs. Krish is part of a boutique analyst firm that offers strategic advise to both Cloud Computing and Open Source vendors. They also help buy side businesses take advantage of Open Source and Cloud Computing. More information about Krish and his research can be found in his personal website. Krish's disclosure statement is available here.
So RS advocates always maintaing 50% of your resources unallocated so that you can deploy new apps fast….im guessing the video was made before the financial crisis. (yes im an RS customer with a private cloud)