The best position to have in poker is late position, which is defined as the dealer and the players just to his right. (above)
Being in late position allows you to have a lot more information about how the hand is going -- as you've seen how the majority of the table has decided to play their cards before you have to make your own choice of whether to call, bet, raise, or fold.
Additionally, if no one has bet in a round, the players in late position may win the pot simply by betting any amount -- this is called "betting position." Many poker players know about betting position and may call a bet as a bluff when the dealer or one before him bets, but it works often enough that it's worth trying once in a while.
Sometimes abbreviated "LP"