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...
Data Pads (Backwards Audio)
Level: Winter Contingenency (MISSION START)
Well another user posted an Easter Egg about "Data Pads". But FIRST I am here to state first is that those are NOT Easter Eggs, it is like hunting down a Skull in Halo 2 and Halo 3 or Terminal.
Here is a real Easter Egg about the Data Pads. Now after you kill the invisible Elite running with the Data Pad. You open it up, and all the data pads actually do this, but after reading for a little while, you will hear a voice or audio. You wont be able to understand it. But, if you record it and play it backwards, you can understand it. But one of the interesting Lines that say "Welcome Chiron", sound like this "Ch - eye - ron". We posted a video on this but we want you to hear what it says. And Basically Chiron was a Test station on Mars for Special Elite Spartans. And there is a bit more information at the Halo wikia. Here is the link for more information, http://halo.wikia.com/wiki/Chiron_Test_Station
Go on your hunt for these Data Pads! Sadly there is no reward for finding all of these Data Pads, but it has good information, and a good challenge! Good Hunting! ;)