See:
http://blogs.testbit.eu/timj/2007/06/29/28062007-searchable-api-docs/ (page moved)
Newly built GLib & Gtk+ API docs are online now. In the process, i fixed a long standing documentation feature request: searchable API docs. This turned out to be the most requested documentation feature at the GNOME booth LinuxTag 2007.
The documentation updates cover Gtk+-2.11.4, so they contain new features like: GtkBuildable, GtkBuilder, GtkScaleButton, GtkVolumeButton and GtkTooltip.