Dissecting 0.9's dojo.js | The Dojo Toolkit: "It is entirely possible to use just dojo.js and nothing else from Dojo, and still build great progressively enhanced web sites. It can be considered similar to the basic jQuery or Prototype libraries. It includes all the basics you need from a JS library: DOM querying, event binding, XMLHttpRequest (basic AJAX) and basic effects, plus a few extras for module loading and making JavaScript, CSS styles, and the DOM easier to use."