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I ran across this great comparison between Prototype (a popular javascript library, most notably used natively in Ruby on Rails) and Atlas.

I have never hidden my distaste for Atlas, I think it’s too bulky and complex, but perhaps the future of JavaScript is huge client-side engines like Atlas. As download speeds get better and better maybe the bulk won’t be a problem for users. If we are going to have a client-side engine like Atlas though, I would much prefer complete access to all of that JavaScript… and the rights to modify and re-distribute (which is what you would be doing when any user hit your website), something I doubt we will ever get from Microsoft.

-James