Any Gnome [1] coders (especially beginners) out there would benefit tremendously from reading Havoc Pennington's new GTK+/Gnome Application Development [2]... and thanks to the Open Publication License [3], you can read it here, broken down by chapter [4].
Links:
[1] http://www.gnome.org
[2] http://www106.pair.com/rhp/gnome-app-devel.html
[3] http://www.opencontent.org/openpub/announce.shtml
[4] http://oss4lib.org/ggad/index.html