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The April 2011 issue of MSDN Magazine features an article on the Windows Azure AppFabric Caching service written by Karandeep Anand from the AppFabric product team, and Wade Wegner our technical evangelist.
Read the article to learn what is the Windows Azure AppFabric Caching, what it is good for, and how to get started.
Follow this link to the article: Introducing the Windows Azure AppFabric Caching Service.
If you want to start using the Community Technology Preview (CTP) of the Caching service you can sign up at: https://portal.appfabriclabs.com/ and get an idea of what will be released as a production service soon.