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...
Hidden Picture of Headlong on Breakneck
This is the hidden picture of Halo 2's Headlong on Halo CEA's Breakneck. It is located right behind the wall that meats land and water, you can not see it unless you are in a Banchie or in Theater mode. A little memorial to Halo 2, kind of a weird Easter Egg though because this game takes place before Halo 2. :/