After being in development for several years, the first release candidate of the wxWidgets 3.0 tool-kit is now available. This update to the wxWidgets cross-platform GUI tool-kit has received extensive changes to make this a very exciting and worthwhile upgrade.
Among the features to wxWidgets 3.0 include better and simpler support for Unicode, a new OS X / Cocoa port, 64-bit OS X support, and support for the GTK+ 3 tool-kit within wxGTK. There's also many other new features and changes.
More details on this major update to the cross-platform wxWidgets user-interface tool-kit can be found at wxWidgets.org