Yesterday we released qooxdoo 0.8-alpha2. This is another important step forward to the 0.8 final. The release does not offer many new features (most new features are ported widgets), but a polished and improved APIs instead.
My personal favors are the newly introduced sub-control handling and state inheritance. You can see the latter in action in the Spinner demo inside the demobrowser. If you toggle the button labeled "Custom style" the Spinner's child widgets will inherit the state from its parent and get styled as defined in the theme.

Be sure to read the release notes for details.
Happy coding. :-)