Whenever I consider learning some AJAX, I find it frustrating trying to figure out which AJAX framework to use. In the article “AJAX: Selecting the Framework that Fits“, Dr. Dobb’s Portal reviews five popular AJAX frameworks, going by the criteria of widget availability, ease of maintenance, download size to client and available documentation. The reviewed frameworks are Dojo, Prototype with Scriptaculous, Direct Web Reporting, Yahoo! User Interface Library and Google Web Toolkit. If you want to skip reading the article: the Yahoo! User Interface Library wins, though your mileage may vary depending on your projects and criteria.