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AJAX makes a web page to loaded dynamically. We don't need to refresh page everytime we make a change.
I am not sure on "What new features ?" There might be a lot which depends on your requirement.
As of me, User Experience is the best part of Ajax. It eliminates the "START-SOP START-STOP START-STOP" factor. When you have huge hit rates over the system, It really matters.
IMHO
Ajax has the following key features which makes it so powerful
1- Asynchronous communication between server n client
2- bosst web app speed due to partial postbacks rather then full post backs to server
3- Efficient use of bandwidth (though the differnece can be small but it does impact when you have bigger userbase)
