7. IaaS, PaaS & SaaS Source: AMR, Gartner, IDC, William Blair & Co Cloud Infra : Infrastructure on demand - makes pay-by-use feasible. Vendor: Amazon EC2, GoGrid Cloud OS : Defines an auto scaling architecture over IaaS. Vendors: Google GAE, MS Azure Cloud Apps : Application delivered to the end users on a pay-by-use model. Vendor: Salesforce.com $9b by 2012 @ 160% $4b by 2012 @ 60% $21b by 2012 @ 20% Cloud Middleware : Simplifies SaaS development, accelerates time to market & ALM Vendors: OrangeScape, force.com, many others