something to share with u all:

http://aero.ycis.edu.hk/~luijt/friends/ab.htm
http://aero.ycis.edu.hk/~luijt/friends/abc.htm
http://aero.ycis.edu.hk/~luijt/friends/abcd.htm
http://aero.ycis.edu.hk/~luijt/friends/abcde.htm

go to the links... i find then quite meaningful :) Remember on ur speaker!