Adam Gross, Salesforce.com's vice president of developer marketing, offers a word of caution to developers pondering the cloud: Developers need to understand about the providers they are choosing. "They should develop their applications in such a way that they could be moved off that platform," Koomen says. Google enables such mobility by supporting the popular Python language and the Django Web framework, he says, and is working on open source uploading and downloading tools for moving data in and out of App Engine.
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