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...
Getting Vehicles in the Final Battle
Level: The Great Journey
You can actually get a number of vehicles inside the final battle. It works with ghosts and banshees. The trick is pretty much to clip the wings off vehicles if they are too large and then park it right outside the door that gets you a checkpoint. Once you go and trigger the cutscene you can backtrack and it wont have disappeared.