Amazon just made EC2 a lot more elastic. They have already made it possible to run an arbitrary database on their service - now they've added Windows:

The backend servers that power the world of Internet Services have become increasingly diverse. With today's announcement that Microsoft Windows Server is available on Amazon EC2 we can now run the majority of popular software systems in the cloud. Windows Server ranked very high on the list of requests by customers so we are happy that we will be able to provide this.

That makes Amazon the default spot to run a cloud service, seems to me. Linux LAMP stack? check. Windows stack? check. Something outside the normal range like Seaside? check.

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