This is the method the power levelers have used since closed beta and I finally got one of them to give it up. It is by no means the way to go if you want to maximize your experience in the game as this method will bypass almost all the content in the game and essentially ignore many of the fun, unique aspects of WoW. This is not recommended for new players and is meant for players who already have experienced the content and just want to level up an alt to play with their level 60 friends (ie. your level 60 instance group needs a priest and there are no priests to be had). As a benchmark to how successful you are with this, download cosmos (Cosmos) and use the clock feature to measure your xp/hour. At level 50 you should be getting about 40,000+/hour.

1-20: Newbie lands, stick to the friendly zones (not contested). Just grind. The quests are a waste of time up to level 20 if you are focusing on maxing out xp per hour. 20-26: Wetlands quests and raptors/slime/orcs for grinding. Redridge mountain Lakeshire quests.

26-30: Duskwood quests and undead for grinding. Hillsbrad critter roamers for grinding.

30-35: Did these all in a day on Daggerspines in Hillsbrad right next to Southshore along the coast. Huge spawn, very fast respawn rate, easy mobs to kill. Purgation isle (island in the very far Southwest water area of Hillsbrad) also a nice secluded place you can grind on undead.

36-40: Hillsbrad southshore quests. Desolace quests and kodo grinding for 36-38, then Undead Ravagers in the southeast for 38-40. Cresting exiles at the circle of outer binding in Arathi also for 37-41; extremely easy mobs with a fast respawn. Alterac ogres from 35-40 for grinding. Drywhisker kobolds in Arathi east of Hammerfall for 36-39 for grinding.

41-45: Hinterlands trolls, owl beasts, and wolves for grinding and quests. Badlands ogres, gnolls, and quests.

45-48: Tanaris quests and pirates on the eastern paninsula for grinding. Stranglethorn vale quests (only if you need rewards imo). Badlands greater elementals for grinding.

48-52: Felwood deadwood gnolls for grinding and quests from the sanctuary in the south. Blasted lands dreadmauls for grinding. Un'goro crater (best started at 50) for primarily quests and grinding off the plants and tar elementals. Azshara undead highbornes and thunderhead hyppogriffs for grinding.

52-55: Azshara blood elves for grinding. Burning steppes dreadmaul rock ogre caves firegut ogres (very low AC) for grinding. Felwood irontree woods and cave for grinding (great spot). Western plaguelands questing for argent dawn and grinding on undead throughout the various camps.

55-58: Eastern plaguelands quests from the sanctuary, grinding on undead at the ruined towns. Winterspring grinding at winterfall village or Lake Kel'Theril undead highbornes (my personal favorite camp). Blackrock Stronghold in Burning Steppes for grinding.

58-60: "The" yeti cave in Winterspring, due Southeast of Everlook (very nice place). Grosh Gok compound ogres in Deadwind pass (great spot, no one knows about it). Eastern plaguelands Fungal Vale undead grinding and argent dawn token farming. Moonowls in northeast winterspring for grinding.