Multimedia Links

First, there are many good multimedia resources available online at
There are all sorts of resources (videos, interactive media, photos, sounds, charts, etc.)
and they are sorted by subject area, whether you teach Grade 12 Chemistry or Grade 2
Social Studies.

I have found Powerpoint templates (in game show format) by Mark E. Damon to be some of the best. 
Some of his downloads are available here.