TaoSecurity compares Sun’s thin client solution Sun Ray with other thin client technologies and concludes that Sun’s approach is more secure, because Sun’s clients are very simple. Most of the work is done on the server, which can be maintained and patched on a central location. The clients hopefully don’t need a lot of patching due to their stripped down operating system.

To be honest, this sounds to me as if Sun has just reinvented the X-terminal.