PSMTabBarControl remains the best way to have Safari-style tabs in your app. This fork makes it easy to use PSMTabBarControl when developing apps for 10.6, 10.7, and 10.8 using Xcode 4. It is also Retina-ready.
This fork contains none of the IBPlugin stuff, and removes unnecessary graphics to get a much smaller framework size (about 668kb uncompressed, 232kb deflated).
If you make any improvements, please submit them as pull requests.