Windows Azure Services Platform
Microsoft intends its new Windows Azure Services Platform to be a serious cloud computing platform for a broad range of developers and scenarios, from lone developers starting up a new Web-based company on a shoestring to large teams of enterprise developers looking for high-performance, highly available, and scalable Web sites, computing, and storage. A few years out, Microsoft wants Azure to be seen as the preferred location for enterprise data, not as a business risk. It's off to a good start.
There's a tremendous amount of capability being presented in the Azure CTP (Community Technology Preview), and there's more to come. It goes beyond simple Web hosting to a flexible architecture designed to automatically enlist additional resources in response to demand. There are capabilities here that I haven't seen in competing cloud offerings -- for example, workflows. The Azure team has picked and chosen existing Microsoft technologies -- virtual servers, the .Net Framework, IIS, worker processes, databases, queues, enterprise service bus, workflows, authentication, and so on -- and adapted them to the cloud.