Thanks, Wikipedia!

Ephemera is transitory written and printed matter not intended to be retained or preserved. The word derives from the Greek, meaning things lasting no more than a day. Some collectible ephemera are advertising trade cardsairsickness bagsbookmarks, catalogues, greeting cards, letters, pamphletspostcardspostersprospectusesstock certificatestickets and zines. Decks of personality identification playing cards from the war in Iraq are a recent example.(Other examples of Ephemera can be found on Ebay under the catagory of Ephemera.)