I suppose it's a subset of the "how much gear" argument, but I can't believe you missed the Great Foot Retention Wars, and the Battle of the immodest Bulges (lycra). Major slip-ups there, Banzai.
As for Shimano v. campagnolo...who commutes on campy?
I did miss some...
I should have clarified better (I was writing something silly in a hurry) but I was kinda thinking about clipless and lycra as "bling".
That's clever now that I think about it; Brooks, Breaks, and Bling...the three contentious "B's" of bicycling!