I've put on my web site the win32 port of GtkGL for those interested in developing cross platform OpenGL applications (at least between Linux and Windows) using the Gtk widgets for a GUI...
http://members.aol.com/suboner/code/Gtk/

I've done this because the only other available source for this port is through the GNOME CVS tree, as far as I could search, which is not really convenient place to have it if you are a windows developer looking for something like this.