Play Value also has a brief history of the Playstation,
http://www.onnetworks.com
The video is also on Youtube but i'm on a place where i can't put the direct embed.
Some people say that Sony was the one screwing Nintendo first, they're sort of right just a bit (The reason Nintendo went to Philips was that Sony was demanding complete control on the CD titles) but the problem was not who did it first, but who did it worst: Yamauchi & co. canceled all their plans in secret (not telling Sony anything), and really humilliated Sony at CES 91 when one day later of the Sony announcement Ninty reveals the partnership with Philips... They could've stopped them before the keynote, saying to them that the deal was over, but they didn't...
I respect Yamauchi and co. for all the business decisions that made Ninty great (one of them hiring the genius Shigeru Miyamoto and giving him the chance of making the sink-or-swim game that was Donkey Kong, the rest is history), but sometimes they screwed up in a lot of ways (The Sony humilliation, the alienation of 3rd party like Squaresoft), and that costed them the 1st place for 2 consecutive generations, until Satoru Iwata stepped up, now that they're in 1st place again (and making more money than they ever did), they should not repeat Yamauchi & co. mistakes, because now, in addition to Sony, there's Microsoft doing anything they can to take both companies down.