The Computer History Museum has published all the conference video from the PLATO@50 conference. I think game developers will find the session on PLATO gaming interesting. If you only have time to watch one video, I would suggest the first one which is an overview of the PLATO system. For those with an interest in the origins of the plasma display panel, check out the hardware session. If you have an interest in social networking software, check out the online community session. Of course, if you’re a PLATO junkie, watch them all!