“Questing.”
While Frodo Baggins had one major quest, destroy The Ring, I’ve found myself in a cesspool of incomplete quests, filling my quest book to the brim with worldwide travels. From coast to coast, island to island and across the open seas I’ve got missions to complete with no end in sight.
It’s an addiction, a fascination, an uncontrollable urge to click any creature with an exclamation upon his head. I cannot stop taking on the responsibilities of the world all upon my lonely shoulders. Unfortunately, travel time is not free and I find myself traveling the world in search for quest “turn-ins” and random item drops from creatures small and tall.
When does it end? I turn in a quest to get another! A few quests have me traveling to far off lands where more villages scream for my help with yellow “!” above their heads. I must help a wandering soldier, a fisherman, a poor villager and the beggar; I do it all “for the horde.”
You can have something like 20 quests in your log at a time, I’ve got it full with quests from each land. Perhaps someday I’ll complete them all or throw them away to pickup others, realizing the value of each quest will decline as my character levels.
The lesson here, stay where you are until the quests in that land have all been exhausted. Ah, the trials of a wondering adventurer striving to conquer the land.
Many folks know the name Peggle as an addictive 
As the Wrath of the Lich King beta lives on, the world (and software behind it) is ever changing. Apparently, the rune system has changed a lot since its first inception. This requires a delicate balance, as the goal is a well rounded Death Knight class without epically overpowered features. Too much power and people will feel cheated while others feel overly destructive. End result, everyone would be a Death Knight.