Seems Frameworks are the way people are moving with Ajax, and everyone wants to try their hand at bundling various usefull tools together.
Zephyr is the name of the main ski lift at Winter Park in Denver, where i skied last year incidently, but thats not the reason why im profiling it. It is also a pretty usefull PHP 5 MVC ( Model-View-Controller) framework that supports complete separation of business logic layer from presentation layer. It takes well known Ajax tools like Prototype etc and combines them into its tool set. Although only in Beta 2, this is one to keep an eye on.

Check out this Ajax Chess Game for some fun.