If you have an MSDN Premium or BizSpark subscription you should be aware that for the next 8 months you automatically have 750 Windows Azure Compute hours, 10GB of durable storage and 1,000,000 transactions per month absolutely free! 

You also have free allocations of AppFabric services (Service Bus and Access Control Service) and SQL Azure databases as well.  See this MSDN Subscriptions page for details.

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After 8 months it does go down a bit, so I encourage you to take advantage of this great opportunity now.

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