Anyone who is looking at moving or developing new applications to Cloud needs to determine the cost of hosting the application.
Microsoft offers a new tool that make this process easier.
This is beneficial when you have already determined the high level design of your application. You can use this calulator to determine the costs and also find out any promotional offers that can help in reducing the costs.
Window Azure Pricing is available here.
Microsoft also offers a large number of promotional offer for Azure. You can compare them here