"Does anyone know of a good tutorial that I can download that is about GTK+ (using C++) and using the glade developement environment?"
Here is a Gtk+ tutorial
Here is a glade 2 tutorial
Strictly speaking Gtk+ is not C++ but it works OK with C++. I believe that you
have to use C style comments instead of C++ style comments.
Be prepared. Create a LifeBoat CD.