Recent MochiKit commentary
For those not watching the entire blogosphere, here's two pretty good articles/posts about MochiKit that have come up recently:
For a little more commentary on that post, you might look towards the Ajaxian blog coverage.
Jeff Shell put out a little head-to-head between MochiKit and Prototype from a Zope user's perspective: http://griddlenoise.blogspot.com/2005/09/prototypejs-and-mochikit.html
What Jeff doesn't seem to mention in his article is that his AJAX example actually shows Prototype and MochiKit living in harmony (using Element.show and Element.fade from Prototype, with MochiKit's AJAX support). That actually does work. Personally, I'd have demonstrated the AJAX stuff without the Fully.Qualified.Names in that scenario (to show MochiKit in its best light in comparison w/ Prototype), and used showElement instead of Element.show (saves a character, removes a Prototype dependency ;).