AJAX Security Issues Discussed
The Technoblog site has a really good article about AJAX security issues. To be completely honest until reading this article I have not considered every security issue that an AJAX enabled site could raise. We all need to start somewhere and I think this article is a good place to start learning these potential problems. I went so far as to read all the comments related to this post and picked up some interesting opinions on the subject there as well.
reference: Ajaxian