GanttProject 2.0.10 is finally here. It is a relatively big update which fixes a few important bugs (e.g. it makes "Critical Path" feature working), adds an option to create rubber dependencies by default and adds an experimental iText-based PDF export.
Installer for Windows, package for Mac OSX, platform-independent ZIP archive and source code are available on our downloads page on Google Code Hosting. Web Start edition and other updates will follow soon.
Enjoy the new GanttProject!