I had previously had an account here,but being as im the power lurker, I've sadly forgotten it So i made a new account to post this,as i thought a lot of you would enjoy wasting hours watching these. This one in particular is Romero talking about the creation of Doom. Many,many many more on the main site...enjoy!
http://www.gdcvault.com/play/1014627/Cl ... Postmortem
There are much older games than Doom talked about,you just need to look through the vault here.....
Edit* Also about tech in general, a few of the talks by Intel are pretty good also.