Catching his breath alongside a road near Seattle, WA USA
1999 K2 OzM, 2001 Aegis Aro Svelte
Check your pedals. If they're gouging into the cranks then you might want to consider using washers. If not or you don't care then I wouldn't bother. If you have carbon cranks and the shoulders of the pedals are touching beyond the non-metallic threadsert of the cranks thus contacting the carbon itself then it's probably a good idea to use washers to cover that area.
Specialized Roubaix, Bianchi San Jose, '87 Schwinn Super Sport
Thanks guys. They didn't come with any of the cranks on any of our bikes, and they seem fine. I always make a point to grease the threads and the face of the threadset, and I haven't seen any gouging or galling.