Follow up for AJAX Interface Design
Ajax Mistakes
A list of the many mistakes developers using Ajax often make. Javascript itself is a dangerous UI technology, but I've tried to keep the list to problems particular to Ajax development.
Follow up for Event: Rich Internet Applications
RIAs: A Survey
If you're interested in the architecture of this stuff, SDForum's Software Architecture and Modeling SIG will be focused on the topic of "Architectures for RIAs" at our June meeting.