adaptive path >> ajax: a new approach to web applications

If the author is correct that the biggest challenges moving forward are for designers to think outside the normal limitations of the web, the I've already done so in my designs for our next big app at work. The next question is, do we need all this to achieve what I've designed? We've been using 3 of the five technologies, Web Standards, DOM, JavaScript/JSON objects. If all we need is to save data without refreshing the page that's done easily enough within an iframe. It's only if we decide that I need data from the database on the fly that I'll need XML, XSLT and XMLHttpRequest to get that data without refreshing the page. I guess I need to learn more about how this technology works, and then take another look at what I've built.