If you like your information spoken rather than written, here 'tis: http://pragprog.com/podcasts
... in which my coauthors and I talk about the origin and uses of Dojo.
The book is nearing the end of the writing cycle, but we left some topics on the floor. At some reviewers' requests, we're going to put a chapter in on future directions and other interesting modules.
"You mean you can't describe a JavaScript toolkit in 500 pages?" you might ask. Dojo is really more of an ecosystem than a toolkit. DojoX, the extension module, is like a greenhouse where interesting, small plants grow. It's like getting your Perl with CPAN in the same download.
