Retronauts is an excellent and informative website which provides free podcasts about old computer games. There are over 150 podcasts about a wide variety of gaming topics. The subject matter is always meticulously researched and presided over by the incredibly knowledgeable Jeremy Parish and Bob Mackey. Being an American podcast there is very little discussed about the British micro computers of the late 80s and early 90s, so don't expect any Amstrad, BBC or Spectrum discussions but they do cover almost every other computer out there.
The most recent incarnation of Retronauts was crowdfunded through Kickstarter after the 1UP gaming website closed, which was where Retronauts first started. I've listened to all the podcasts and love them so I thought I'd share the love!