Saw this link to Dojo over on a neat page talking about using Ajax with WordPress to do inline editing of entries.
The Dojo project is working to build a modern, capable, “webish”, and easy to use DHTML toolkit. Part of that effort includes smoothing out many of the sharp edges of the DHTML programming and user experience. On the back of such high-profile success stories such as Oddpost, Google Maps, and Google Suggest, the XMLHTTP object has been getting a lot of attention of late. Sadly, in spite of all the coverage, developers have been on their own when it comes down to solving the usability problems that come along for the ride.