Update: A new version, 13.09, has been released. It fixes a bug for recent GCC versions on x64 systems.
A new version of lgob has been released (grab it here), fixing some confusions between Lua versions and updating some modules (GTK+ 3.8 now). It currently works only with Lua 5.1, but should be easy to port to newer versions.
lgob is a set of Lua bindings to GObject-based libraries like GTK+ and WebKitGTK+. Almost all functions are wrapped automatically, at compilation time, by using the information provided from the GObject Introspection project.