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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Halo CE Pistol on Tombstone
After the notoriously overpowered Halo 1 pistol was weakened dramatically in Halo 2, the team responsible for Halo 2's maps, Certain Affinity put the pistol on the map inside a fence just to tease fans of the old pistol. It has been confirmed that you cannot actually pickup the gun, it remains a decorative feature.