Clearing all materials.

I have a model and I want to clear all the materials from it instead of clicking each object and removing it as a user (I have a lot of objects). Is this possible?

Select the object with the material you want to use first.
Add to the selection all the other objects.
Then, in a 3D window press CTRL-L and choose Material from the menu that will popup.
This will link the material in the first object to all the other object. Making all objects have the same material.