SitePoint: The JavaScript Library World Cup Here's a really useful article... it's not often that someone actually comes out and tries to objectively rate the top Ajax libraries. My past attempts were only possible because they focused on one narrow attribute--cross-browser support--but here, Dan Webb describes each of four top libraries--Prototype, Dojo, YUI, and Mochikit--and gives his candid opinions of each. The "winner" may surprise you!