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...
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Morse Code and Halo theme songs
Level: High Ground
There is a Morse Code signal coming out of the radio on High Ground in the base behind the flag. There are 3 separate messages: First translates to "Frogblast the Ventcore" Second is an acronym "sababwl. This acronym also appears on the Halo Soundtrack. It relates to a quote by Joe Staten, who was quoting Marty O'Donnell, "XBOX Halo is shiny and bumpy and bursting with love!". The third translates into "Don't make us kick your ass". Then after the messages, you may hear some Halo theme songs playing off of the radio.