Farming in World of Warcraft can be a pain in the ass. It takes time, its boring, and you are doing the same thing over and over again. WoW Insider list some ways to make it "better".

• Farm in a group, preferably with someone who can AOE or heal. This makes farming much easier. Also, if you're after a drop, try to confirm that they're not interested in the same drop.
• Set short-term goals. "I'll kill fifty guys, then I'll go quest." "I'll circle this three times and then I'm going to go to bed."
• Put something on in the background. I prefer Pandora Internet Radio, or stealthing and going to troll some forums, but I managed to get down four episodes of LOST in windowed mode while searching for protection potion recipes back before TBC.
• Start randomly talking to people, either in Vent or in PMs. I spent about half of Black Morass last night arguing about whether Superman or Batman was cooler ("Batman just has money! Superman's powers are innate, which makes him better." "Innate powers make Superman a wuss! He's like a rich kid with a bad haircut.")