The Dojo folks have a site setup for examples and a little learning. For example, you can see examples of all the dijit widgets at: http://dojocampus.org/explorer/#Dijit. The main site is of course at: http://dojocampus.org.
I haven't looked at the tutorials yet to see how good those are. The dijit examples are very helpful. Will post more if I get a chance to take a better look at this.