While browsing the Harbor Freight catalog, I noticed Clevis pins, and thought that they would be a welcome addition to my tool bag:
http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=94460.
I bought the 74 piece assorted set on sale for $11.99. Easy enough to figure out how these may come in handy on the road temporarily replacing bolts that may shake free while riding, like a foot peg bolt.
I'm throwing a small handful in my tool bag.