A Teacher's Guide to the Holocaust
A great site for instructional resources on the Holocaust. There is illustrated, historical background of the rise of the Nazi Party, the Nazification of Germany, the Jewish ghettos and concentration camps.
Valiant Technology
If you want to use a Roamer floor turtle for control technology, the Valiant site has free resources including programming instructions, classroom ideas and activities.
Watercolour Workshop
An online resource of watercolour techniques. There are sections on materials and instructions on how to use watercolours which include colour theory, planning washes and painting shadows, figures, skies and trees.