This should help people with some of the first problems that they are likely
to find when porting apps from gtkmm 1.2 to gtkmm 2:

Some of these are explained in more details in the CHANGES file.

* Use pkg-config checks instead of the various old .m4 macros:
  See the gtkmm_hello package:
  http://cvs.gnome.org/lxr/source/gnomemm/gtkmm_hello/configure.in#29
* Replace gtk-- 1.2 includes with gtkmm2 includes:
  e.g. #include <gtkmm/button.h> instead of <gtk--/button.h>
* Use new signal connection syntax:
   e.g. change
   button.clicked.connect(
   to
   button.signal_clicked().connect(
* Use new SigC::slot() syntax:
   e.g. change
   button.signal_clicked().connect(SigC::slot(this
   to
   button.signal_clicked().connect(SigC::slot(*this
                                              ^^^^^
* Change virtual methods overrides used for signal handling from
  signalname_impl() to on_signalname().
* Do not connect to a Gtk::Window's "destroy" signal.
* You do not need to connect to Gtk::Window's "delete_event" signal just to
  prevent self-destruction of the window, or to quit the application 
  appropriately. In most cases you should just use the new 
  Gtk::Main::run(window) override that shows the window and quits when it
  is hidden.
* Change Gtk::Widget::set_usize() to Gtk::Widget::set_size_request() or Gtk::Window::set_default_size().
* Change Gtk::Window::set_policy() to set_resizable().
* Change Gtk::wrap() to Glib::wrap(), and gtkobj() to gobj().
* Change Gtk::Pixmap to Gtk::Image
* Change enums from GTK_FOO to Gtk::FOO and GDK_FOO to Gdk::FOO.
* Gtk::Notebook: Change set_page() to set_current_page()
* Container STL-style interfaces: items are now references rather than pointers.
    For instance, change
      menuList[i]->somemethod() to
      menuList[i[.somemethod()

* Replace Gtk::Text with Gtk::TextView.
* Replace Gtk::CList and Gtk::CTree with Gtk::TreeView.
* See the GTK+ 2 C porting guide:
    http://developer.gnome.org/doc/API/2.0/gtk/gtk-changes-2-0.html
  amd the GNOME2 C porting guide:
    http://developer.gnome.org/dotplan/porting/


gnomemm:
* Replace use of Gnome::Dialog with Gtk::MessageDialog.
* Replace use of Gnome::PropertyBox with a similar, but custom Window
  class.