Lift and Goat Rodeo -

Lift’s support for Ajax and Comet (a.k.a, Ajax Push or long polling) is unparalleled. There is no other framework that allows you to build a real time chat app in less than 30 lines of code. Lift’s abstractions of long polling combined with Scala’s Actors provide an amazingly simple way to build web sites that update automatically and scale very effectively, and without deadlocks and other hallmarks of multi-threaded code. Lift’s pattern of binding HTML elements to functions provides a secure, unified, and extremely concise mechanism for developers to write standard HTML as well as Ajax apps.
(Link: Lift and Goat Rodeo -)