In response/acknowledgement/commemoration of Mike’s recent entry, do I submit my own admission to geekery on the RPG scale… Though it has faded into implosion, I once maintained a site dedicated to Shadowrun. These articles are all that survive. Detailed there: obsession to detail, attempts at scientific plausibility, and a focus on how the mundane can get wrapped up in your game life in ways that don’t make sense at first.
What’s missing: Oodles of N/PC data and the details of a flexible adaptation of core 2nd ed rules that we got working so smoothly at one point that it was almost embarrassing we didn’t try to submit for 3rd edition. *ahem* Now I’m just talking out my ass.