Typically I take a break from all things retro during this time of the year, but I have done a terrible job. I have been buying games and I even sat down with Robert Downey of Do-Gooder Gamers (A collective of charitable gamers looking to make a difference, and have fun while doing it.) on his podcast Collector's Quest to talk about the process of collecting games, types of collectors, and some other basic collecting information.
Listen to Episode 2 (I think we hit a good stride here and is a better episode overall)
Listen to Episode 1 (A good start with good info but not as refined as episode 2, stick with it)