I’m interested in Ajax for a number of reasons, primarily because it makes users experience of the web so much richer, as well as the neat way that it allows you to code using a framework. There are loads of frameworks out there, and many are pretty bad, but Max Kiesler has done a round up of 50 of them, which is pretty conclusive. Its not a full list as there are new ones revealed every day, but a good overview. Frameworks can be restrictive and hinder a project so using one exclusively is probably not the way to go, often a mixture of one or two can enhance projects.