Here's a presentation I gave last year about the Dojo library.
The presentation will teach you:
1. What is Dojo.
2. Dojo design goals.
3. Dojo concerns (widgets, packaging, data access, DOM scripting and performance).
4. Difference between Dojo Core, Dojo Dijit and DojoX and what's inside each package.
What is Dojo 1.0 and Beyond
For more about Dojo, visit dojotoolkit .