I think there are several really great frameworks out there, each one target to specific audiences. I see the current situation as follows: jQuery: The "I don'

I think there are several really great frameworks out there, each one target to specific audiences. I see the current situation as follows: jQuery: The "I don't have to learn JavaScript" audience, quick+easy to improve certain page interactions. Tons of plugins, but quality and customization options vary wildly. Prototype: The "I'd like to roll my own components" audience, very Ruby-like, super-easy to do your own specialized UI stuff. Has a learning curve, however. Dojo, YUI: The "I'm enterprisey and like to edit configuration files" audience. Componentized frameworks, which can do everything (but make tradeoffs for complexity). And of course there are others, serving various niches. Your choice depends: Site or app? And do you just want to skin some prefab components, but your site will look like thousands of others, or do you want to roll your own and do more complex stuff and stand out of the crowd?