Wow Levelling Guide: Level 55-60:

- Winterspring [Everlook, Starfall Village]
- Western Plaguelands [Chillwind Point]
- Eastern Plaguelands [Light's Hope Chapel]
- Instance: Blackrock Depths
- Instance: Blackrock Spire [60]
- Instance: Stratholme [60]
- Instance: Scholomance [60]
- Grind Area [55]: Felstone Field, Dalson's Tears, The Writhing Haunt, Gahrron's Withering (Western Plaguelands)
- Grind Area [56]: Northridge Lumber Camp (Western Plaguelands)
- Grind Area [56]: Corin's Crossing (Eastern Plaguelands)
- Grind Area [56]: The Pillar of Ash (Burning Steppes)
- Grind Area [56]: Winterfall Village (Winterspring)
- Grind Area [57]: Blackrock Stronghold (Burning Steppes) [NOTE]
- Grind Area [57]: Ice Thistle Hills (Wintespring) - Rugged Leathers

Notes: Blackrock Stronghold is probably the best place to grind for a rogue; however, you do have to get used to how the roamers work. You'll probably die a few times along the way while learning them. Also, this might likely be another area where they're increasing the armor on the mobs, but two of the four kinds of orcs that spawn are casters, anyway. Ice Thistle Hills is not the best place to grind for experience, but it's probably one of the better places to get a nice quiet grind going and also leave with a few backpacks full of Rugged Leather.

Okay -- So this isn't really a "complete" grind area list, because honestly, you only have to sit down and grind at one or two places for a few levels before you can move onto the next tier of zones, and that's typically what I did. Just sit down and grind at one place, don't move around everywhere and you'll be out of there in a few hours or days. I've tried my best to list the best quest areas and zones as well for those that would rather try to quest and not grind their way through the game, too, but that's also somewhat incomplete, especially at later stages since I don't have much knowledge of the various new quests they implemented in Winterspring and the Plaguelands.

Anyway, hope it helps to answer some of the "where can I go at level X?" questions.