Jamie Lendino of ExtremeTech has posted a lovely article called Play Retro Games on Your Modern PC. It covers vintage computers, consoles, legacy PC games, MAME, and abandonware. If you've been wondering how to revisit that Apple II favorite or Atari ST GEM environment, this is a great place to start. I also greatly appreciate the "further reading" section, which cites Dungeons & Desktops and Vintage Games as must-reads on the topic, as well as our Gamasutra articles. Check it out!
And it links to a few good articles, like one about the HORRIBLE job we do of caring for our history in video games.