I believe videos or video clips can be a great educational tool. Obviously, they appeal to visual and auditory learners. Yet, they can also help build background knowledge for all students and explain tricky concepts more clearly. Videos lend themselves to students making connections or asking questions. Learning becomes more relevant when students are shown real life examples.
Where can teachers find awesome videos, appropriate for school? Have you heard about PBS Learning Media? What a fantastic resource for digital resources, and it's FREE! There is a very simple registration process, and then you have access to thousands of videos. There are also photographs, audio clips, and interactives you could use with any IWB.
Hope you find something there you can use right away!