I felt in love with Dojo. I loved the way it interacted with my existing code and its compatibility with MochiKit (that I am currently using).
Unfortunately, I can’t migrate some business applications to it because Opera isn’t supported.
I did test a very simple website using Dojo 1.1.1 from AOL CDN where I implemented just some layout Dijit widgets and an accordion pane, but it wasn’t rendered correctly on Opera.
As I said, too bad because I was really liking Dojo.