D&D: Keeping Track of Reputation

It's rare to find D&D players who truly seem to respect the world and the characters that the dungeon master has created for them. More often, the players are preoccupied with the accumulation of wealth, getting more powerful, and chasing whatever strange, unplanned goal they've decided to pursue, and any inconvenience (object or NPC) will likely be destroyed without a second thought.

In both cases, it's good to have a system in place to keep track of a party's actions, so that their deeds both good and bad will be remembered by the world's inhabitants. A reputation system allows the inhabitants to treat the party appropriately, depending on what they've done to or for the people in question.