A major difference between Halo: Combat Evolved and Halo: Combat Evolved Anniversary is the presence of Terminals in the newer game. These contain copious amounts of information, presented for the most part by 343 Guilty Spark, including hints about the Forerunner, backstory for the Halos, and some clues about upcoming projects in the Halo universe. There is one terminal on each level, and if you find the terminal in-game, you'll be able to unlock it (at relatively low resolution) at Halo Waypoint by inputting the code shown at the end. (It's possible that the link will not work, directly; you can access the Terminal interface by dragging your informational pane at the top of the screen to the right, uncovering a hexagonal button.) Once you've unlocked ALL the Terminals, a bonus 11th terminal will become available, with additional information.
If all of this sounds too difficult, we've made all eleven Terminals available below, in a variety of HD and SD downloadable versions, plus a streaming Flash version. Thanks to Cody Miller for the stellar recording job.
HD versions are 1280x720, SD versions are 640x360.
You can view a streaming version of the cutscene by clicking on a thumbnail.
The Pillar of Autumn (The discovery of Halo becomes even more mysterious when the Pillar of Autumn receives a very familiar greeting.)