Javascript Libraries or Frameworks?

With the exception of Dojo/YUI most of Javascripts are libraries, not frameworks. Frameworks involve a little more (architecture + development tools).

For a comparison of different Javascript libraries/framworks, 

MooTools 1.2

MooTools 1.3.1

JQuery 1.5.1

Prototype 1.7

YUI 2.8.2 Selector

Dojo 1.5
run the following test in your browser at this:
http://mootools.net/slickspeed/
http://blog.creonfx.com/javascript/mootools-vs-jquery-vs-prototype-vs-yui-vs-dojo-comparison-revised