Framing it in terms of useful technology or not is kind of missing the point. AJAX is good enough, or at least almost all developers out there think so. What a

Framing it in terms of useful technology or not is kind of missing the point. AJAX is good enough, or at least almost all developers out there think so. What are you planning to do? Make something for end users, or a tool kit for developers? Either way, you've got to bring some real value to the table. Cleaner code or xy% reduced bandwidth isn't going to cut it. You have to have concrete benefits. What does this technology enable that wasn't possible before? If you can answer that question, you're good to go. If you can't, no ammount of justification or 'developer education' will save you.