This diagram is from "How the Cloud Changes Software Production", by Seth Eliot, Better Software Magazine, March/April, 2011 - http://bit.ly/seth_cloud_better_software
Figure 1 Cloud Resources by category form a stack
This table is a variation of that included with the "Sticky Notes" for "How the Cloud Changes Software Production", by Seth Eliot, Better Software Magazine, March/April, 2011 - http://bit.ly/seth_cloud_better_software
Cloud Category
The Cloud handles...
Examples
SaaS: Software as a Service
Application Functionality such as...
Mail Clients
Gmail Hotmail Yahoo Mail Microsoft Outlook Web Access
Office Applications
Microsoft Office Web Apps Google Docs
Music Storage and Playback
mspot iCloud
PaaS: Platform as a Service
Relational Database Management Systems
Microsoft SQL Azure Amazon RDS
Frameworks and Runtimes
Microsoft Windows Azure - .NET Google App Engine - Java & Python
Web Servers (Web Hosting)
SquareSpace
Content Delivery Network
Amazon CloudFront Microsoft Windows Azure Content Delivery Network
Operating Systems
Cloud Servers generally come with an OS, so see "Servers" under IaaS below.
IaaS: Infrastructure as a Service
Servers
Amazon EC2 - Linux Servers Rackspace Cloud Servers - Linux Servers
Storage
Amazon S3 - BLOB storage Amazon SDB - Table Storage Microsoft Windows Azure Storage - Both table and BLOB