Online GIS applications can be delivered using cloud computing platforms which provide Infrastructure as a Service(IaaS) resources. An introduction to essential cloud computing concepts and considerations will be reviewed in addition to a presentation of public sector industry trends involving other cloud hosted technologies related to GIS applications. The presentation will feature examples of cloud hosted GIS applications at federal, state, and local government levels including the City of Novi\'s ArcGIS Server 10 deployment using a public cloud hosting provider.