There are also official SDKs for Windows Azure in Java, Python, JavaScript and PHP. You don't need to be a .NET developer to think it's a swell platform to develop for.
You never hear about Amazon "going to war" with other companies. Whilst other companies, e.g. Google and Apple, are constantly bickering amongst each other, Amazon just stays in the background, doing it's own thing. I personally think that's a breath of fresh air.