A new article on my website , discussing different javascript libraries available for adding AJAX support to your webpages. Discusses individual strength of six libraries which include:
1] Basic javascript and XMLHTTPRequest object.
2] Prototype.js
3] Dojo Toolkit
4] Yahoo UI Library
5] ASP.NET !
6] Ruby on Rails
Read the article here: http://ashishware.com/Ajax1.shtml