Their illuminating article, simply titled "The making of: MUD" talks not only of what started the system we know, but also how the thinking behind it progressed into the MMOs we know now. Additionally, sprinkled throughout the second half of the article are some really interesting quotes from Bartle. One such example is Bartle's explanation of his current levels of involvement and why he'd rather "...focus on the health of the forest than on individual trees" in terms of the massively multi-player game market. If you're a veteran or a newcomer, the article is well worth a read if only to give a perspective on our favorite genre that you may not have had before.
[Via Rock, Paper, Shotgun]