For those wanting to understand the differences between PaaS(Platform as a Service) and IaaS(Infrastructure as a Service) in Windows Azure, this is a great article written by Bill Wilder.  You can check it out here: http://blog.codingoutloud.com/2013/01/21/beyond-iaas-for-the-it-pro/  Also you can catch up on the series here: http://virtuallycloud9.com/index.php/31-days-of-servers-in-the-cloud-series/