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...
This is a really cool easter eggs and there are a few ways to get it. You need to go part in Metropolis that is outside with the wraiths attacking you. There is a building that has been blasted open on one corner from the scarab beam. You can grenade jump up to it using the blasting abilities of the sputnik skull or use the banshee glitch that is also used to obtain the scarab gun.