The quick rundown of 0.9 features:

Dijit:

unified look and feel for all widgets
ambitious a11y and i18n features in every Dijit widget
a mature CSS-driven theme system with multiple, high-quality themes
huge improvements in system performance
data-bound widgets
Declarations for lightweight widget writing
a new page parser that allows instances of any class, not just widgets
no magic


Core:

reduced API surface area (easier to remember and use)
dojo.query() always available, returns real arrays
from-scratch high-performance DnD system
Base (dojo.js) is 25K on the wire (gzipped)
dojo.data APIs finalized
new build system
new test harness for both CLI and browser use
dojo.behavior now marked stable and based on dojo.query
excellent animation APIs with Color animations in Base (always available)
all the features you’ve come to count on from Dojo (RPC, JSON-P, JSON, i18n, formatting utilities, etc.)


DojoX:

high quality implementations of previously experimental features: gfx (portable 2D drawing), data wires, offline, storage, cometd, etc.
dojox.gfx now includes Sliverlight support
many more features and improvements than there’s room for here.
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