My favorite thing to do in 1st grade (I think it was first at least... who can remember?) was computer time. An hour a day, we got to play on the computers (Apple ][, baby), which all had the best game ever loaded on them - Oregon Trail (click that link to play it online - sweet). Fight dysentery! Ford rivers! Hunt! Not only was I blazing across the 1848 frontier, as a carpenter from Illinois with my 4 companions, I was also... learning. Egads.
According to IGN, Gameloft is developing an iPhone version of the popular 80s game, complete with updated graphics (although I would pay double if there was an option in the game to use original graphics).