Video http://www.eurogamer.net/videos/eurogamer-expo-2011-sessions-20-years-of-id-software?size=hd.

It's about 30 minutes and shows a quick overview of the games by ID Software. He (Tim Willits) then goes off to show RAGE (though the gameplay itself isn't much new, it's really just Tim Willits using the pistol to shoot a lot of mutants).

However, a very cool thing: he shows a secret room in the end, that looks exactly like Wolfenstein but in Rage! And when he goes out of the room you get the point that they show the technical evolution from Wolfenstein to Rage.
I recommend checking the video out

I wanna find that room on my own dudeh thats sad for me that you mentioned there is one... what if i wouldve found it for the 20th time i play it on nightmare and get greatly surprised. Things like this should get the SPOILER button IMO, seriously.

Okay, so I paused the video just to say this. I got serious chills and a major adrenaline rush by just watching the timeline segment before Willits walked in. AMAZING.

its been out for a while search for "ID engine evolution" if u dont wanna get spoiled but wanna see the tech upgrades on youtube and such, terrifyingly marvellous!

Thanks for posting that, OP.

id Software is an amazing developer without whom the videogame industry would be very different today.

Also, Carmack is legend.