Do you have an MSDN subscription? If so, it includes monthly credit for using Windows Azure. Below is a link for activating the Azure benefit, NO CREDIT CARD required!
Use this link: http://bit.ly/140w35v
By the way, all Gold and Silver Microsoft Partners, all members of BizSpark, all companies that have an EA agreement have multiple free MSDN subscriptions. If you are not using those, this is another incentive to start.
The monthly credit is quite generous, more than enough to run your Dev and Test environments for even large application development projects.
Feel free to share this link.