From the "I learned something new" file today, a very good post today by Dare Obasanjo discussing some key aspects of JSON vs. XML when it comes to AJAX-style applications.
However, after reading Dare's post, it leaves me asking the question: Are AJAX Mash-up applications creating a potential security hole by circumventing the security protections provided in most major browsers?
[Update:] Dare has posted two follow up posts on this subject which are also worth a read. I changed the title of this post to reflect the overall theme of his posts. You can follow these links to read the two follow-ups: