If you're weighing/researching AJAX frameworks (as I am) then you might enjoy reading Dojo vs YUI / YUI-EXT vs Prototype / Scriptaculous vs Mochikit vs JQuery - Part 1. Part 2 is good as well. Kaleb, the author, has decided to go with YUI-EXT for the time being.
That's been my leaning as well. Still more research todo before we commit to a switch. We're currently using Prototype and Scriptaculous over at BigBlueHat, but the widget libraries of YUI-EXT and Dojo are alluring to say the least.
Posted by TheIdeaMan at March 2, 2007 01:40 PM | TrackBackI'd give jQuery another look. It faired well in those time trials, the core files are pretty small, it avoids the associative array problems of Prototype, and its syntax is more compact than some of the others.
The major drawback right now is sparse documentation, but that's likely to improve with its popularity, as Drupal and WordPress are switching over to use it.
Posted by: Austin at March 6, 2007 06:46 PM