Cloud Computing

Ten companies to watch

Cloud computing is spreading through the IT world at the moment, with innovative start-ups and established vendors alike clamoring for customer attention.

Generally speaking, cloud providers fall into three categories: software-as-a-service providers; infrastructure-as-a-service vendors that offer Web-based access to storage and computing power; and platform-as-a-service vendors that give developers the tools to build and host Web applications. Here are 10 cloud companies that are worth watching.