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...
Frankie's Face on Halo Ring
If you download the Xbox live map "containment" and then use your sniper rifle to examine the Halo ring you will find none other than Frank O'conner's face in the ring. Frankie was Bungies weekly update writer and community manager for some years and was much loved by the community. His face once again appears in Halo 3's Standoff Moon in the Sky, along with another Easter Egg of three of the same Bungie employee standing on the platform of the Satellites.