CocosBuilder 2.1 is now officially released. Get it from the download page! Main new features (as compared to version 2.0) are:

• New animation editor with support for keyframed animations, easings, multiple timelines and much more.
• Easier to create new projects and new interface files.
• Buttons in toolbar for adding nodes.
• Multiple selections and better manipulations of selected objects.
• Drag and drop of ccb-files.
• Support for iPhone 5.
• Improved support for multiple resolutions.
• Loads of smaller improvements and bug fixes.

If you are updating from version 2.0, make sure to also update the CCBReader! CocosBuilder 2.1 will work with cocos2d 2.0 or newer, some minor bug fixes are available only on the newest version on github (branch develop-v2).