We've just released a new build of ExtensionBuilder, 1.0.2, to the Eclipse update site at http://cssdk.host.adobe.com/cssdk/update/
If you've already installed Extension Builder, you can get this by selecting Help > Check for Updates and following the prompts. If the automatic update process doesn't work for you, see Harbs helpful notes at http://forums.adobe.com/thread/643567?tstart=0. If you do not yet have Extension Builder installed, we will be posting an updated zip version to Partner Portal shortly.
The main enhancements of this release are:
Bug fix to allow debugging from Extension Builder with the latest CSXS update