See Jim O'Neil's post detailing the New, Improved, No-Risk Windows Azure Trial!
Excellent article shows how you can use web services hosted in Windows Azure and have it communicate across various devices, such as Windows Phone, iPhone, and Android. And have that service scale to terabytes in size.
My colleagues Bruno Terkaly and Ricardo Villalobos wrote the article for MSDN magazine Building a Massively Scalable Platform for Consumer Devices on Windows Azure.