Akash did some research about static electricity and provided this funny, interesting video link (you will need a fast connection). http://www.stevespanglerscience.com/experiment/00000113
Also this related page. http://www.stevespanglerscience.com/experiment/00000041
This is another good, easy static electricty demonstration from the Exploratorium!
http://www.exploratorium.edu/snacks/charge_carry.html
Here is an easy demonstration where you can bend a thin stream of water with static electricity. Using a balloon instead of a comb works even better. http://www.sciencebob.com/experiments/bendwater.html
My friend David Williamson has a great page of static electricity ideas and links. http://www.davidkitecam.com/staticgen.html
One of the ways static electricity is useful for: photocopiers:
http://home.howstuffworks.com/photocopier1.htm
Here are some other ways static electricity is useful
http://www.school-for-champions.com/science/staticuse.htm
Another static electriciy "snack" from the Exploratorium
http://www.exploratorium.edu/snacks/electrical_fleas.html