If you're still interested in game archaeology, I would highly recommend you visit The Cutting Room Floor ( http://tcrf.net/ ), a wiki dedicated to uncovering unused/development-related content in early video games. Sometimes authors even put long, rambling messages against their coworkers into games (see the page on Erika to Satoru no Yume Bouken).
Yeah, I know the guy who runs the wiki, he's a really cool guy and has been doing this for a while too. The whole wiki is fascinating if you're into that sort of thing and have some spare time.
