This is a good read that I would forward to anyone who wanted to know why AJAX can not do everything. Having built Flex/Flash content that will run in the Flash Player, I already knew much of these arguments but the article does a really good job of organizing the strengths, weaknesses, and commonalities between the two approaches of delivering information on the client side.

“…in real-wold use, Flex typically requires less coding to build the same or better functionality. The learning curve is higher, but the development times are significantly lower. “

Read the article here at Anthony Franco’s Blog.