Amazon’s EC2 is now available for Windows – squeaking in just before PDC was to kick off. This is quite exciting as it allows you to scale out and try something at a very low cost on Windows.
If you want to manage your EC2 environment, you can use the Firefox add-in called Elasticfox ; there is also a C# library which wraps EC2’s web service API making them easier to consume from .NET.
Amazon is also going to release more features (fairly soon) across the board – load balancing, auto scaling, monitoring, etc.
It will be interesting to see the competitor offerings from Microsoft – should get public details at PDC.