The Cloud market places are emerging for buying and Selling Capacity of IaaS platforms. http://www.spotcloud.com/Technology.5.0.html I am impressed by AT&T Renewed focus on promoting vertical third party SaaS apps from its portal. Salesforce.com has strong ISV community on Force.com - PaaS and has started pitching for migration of Lotus, Sharepoint and other custom Apps into Force.com platform. This Cloud Marketplace trend is a welcome change in accelarating the adoption of cloud services.