I love motorcycles. Always have, and I probably always will. I was very excited to see that Blizzard is introducing them in Wrath of the Lich King. I'll probably spec engineering on most of my characters just to make my own little biker gang. Wouldn't it be great to see a guild rolling around looking like Fel's Angels? But how would others know you are a guild?
Stonewhisper of Scarlet Crusade suggested some additional accessories from other crafters. I like his idea of having guild jackets for raiding. He also suggested using engineering for performance modifications. Something like a rocket fuel for a nitrous-oxide-like speed boost.* I could see a world of after-market parts for WoW bikes: blacksmiths could sell sissy seats and wheelie bars. Tailors could make saddle bags to add to carrying capacity. Taurens and Draenei would probably need some kind of suspension upgrade.