If you're a true setup geek you've already had three or four people forward you this video. The voice over provides an awesome walk through history. The "blue background" comment in the beginning had me chuckling before he even got into the good stuff (Doom II, anyone?)! You have to watch it.
After you watch it, what do you think of the backwards compatibility highlighted in this video? Are the right things migrated and not migrated? Anyone up for a game of Doom II?