If you’re looking to check out Azure development without a commitment, this program will give you access to Azure without a credit card for a month.

Windows Azure One Month Pass
Windows Azure One Month Pass
•Learn about the Windows Azure platform with no steep learning curve
•With Windows Azure you pay only for what you use, scale up when you need capacity and pull back when you don't. We're offering a Windows Azure One Month Pass*, so you can put Windows Azure and SQL Azure through their paces. No Credit Card Required.

Lots of resources on the page also. I’ve added them below for convenience.

Use the pass with the online training below to learn more about Windows Azure:

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Dig Deeper into Windows Azure