From LWN.net: GTK+-1.3.3 has been released. This is a preview release of the
unstable branch of GTK+ and is meant for:
Those interested in the development of GTK+.
People planning to port to the upcoming GTK+-2.0 version of GTK+.
Note: this is a tentative API-freeze release, major API changes
beyond the remaining open '2.0 API freeze' bugs in bugzilla are
unlikely to occour before GTK+-2.0 is released. There's also a similar announcement there for GLib 1.3.3.