Use cases for cloud computing?

Several people keep asking me what are the use cases for cloud computing. Here are those in my opinion (as applicable to enterprises - large, medium & small).

• Test & Development, R&D, for Engineering organizations (eg Soasta)
  
• Storage Functional Offload (eg TimesMachine)
  
• Batch Process Functional Offload (eg Smugmug)
  
• Workload Augmentation (eg Animoto)
  
• Web Services

Depending on the specific nature of the applications, choose your specific cloud implementations (load balancing, scalability, file systems, network,...) etc