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jQuery is *extremely* sweet in syntax, simplicity, power, and "fit" for XHTML/CSS/DOM. That said, its UI suite is not mature and it has missing pieces like combo boxes. For my own part I still pick it because it's so easy to do things yourself, like combo boxes; which I've done and forgotten already because it was a two hour exercise.

Ext is awfully powerful and pretty out of the box. It's also *huge* and many of its pieces are not designed with degradability in mind; its form objects do not plug-into existing forms; they write forms. Not cool. Though the FormFu plugin might be able to do both which could be really neat. YUI is a lot like Ext which is a fork from it but not as powerful or well designed.

I've never used Prototype but I've heard it's not so hot from devs I respect. Earlier versions of dojo were dog barf and had zero documentation. dragonchild has pointed out that the current version is quite nice but I have scars from a legacy app built with an early version (which version was a mystery for quite awhile as the devs didn't even think it was necessary to include a version number anywhere in the code; sigh) and I haven't forgiven the kit yet.

Update: Ext has dual licensing. If your code is OS, it's free. If your code is closed, you have to buy dev licenses.