Yahoo! has developed a Ajax library for developing interactive web page development. This is a very good thing as Yahoo! has been in the business for a very long time and obviously they know how to develop a stable web portal so this library should be fairly stable and ready for deployment in any size business.
You can find out more information here. Personally, I am not a great web developer since I really like to concentrate on Windows Forms applications instead. This should be a real help in my attempting to learn how to build the same functionality into webpages.
You can find out more information about this product here.
http://developer.yahoo.net/yui/