Here is an interesting comparison of Cortana over the course of the 4 halo games:
PTesh adds his dulcet prepubescent tones over the top of one of the new trailers for weapons...
Try upgrading your browser to Google chrome (you wont regret it). There is probably an IE...
Announcer Terminal Egg
At mission start proceed down the pathway and stop at the first computer on your left. The right monitor out of the three will have a terminal like option to listen to recordings. Press "X" to listen when there is silence. If you push the button enough times the terminal will say "killing spree postponed".