I already mentioned this in this thread.
http://www.ironworksforum.com/ubb/no...;f=32;t=000278
Questing is better, you can get 1 level per day.
If you really want to grind for experience and phat lewt. For level 50 ~ 55, try Burning Steppes Ogres or Blasted Land Orges.
For level 55 ~ 60. Try Deadwind Pass Ogres, This place is like a goldmine. You can get nearly 200 gold per day and numerous blues/purples and nearly 30 stack of runesclothes each day. Of course you'll be out of luck if there's a hunter with a King Bangalash farming there *ahem*

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If the Deadwind Pass Orges is crowded, try the Deadwind Pass birds instead. They don't drop much green/blues/purples or any silvers. But they drop numerous loot which you can sell to the vendors. Each bird had a good chance to drop 6 loots so it's not suprising to earn nearly 30 silver per bird.
If you need a change of scenery, try the berserk owls at winterspring ( east of winterspring ). You'll be earning 30% less gold or items than deadwind pass orges but you can get a constant supply of thorium ores. Another alternative are wintersping yetis ( east of winterspring in the caves ). The loots are about the same as those berserk owls but you can skin them for rugged leather plus there's a constant supply of thorium ores.
If you have a good AOE spells, try Hearthglen at WPL, the loots is 20% lower than deadwind pass orges (imo) and the enemies there are tougher.
Else, you can try Tyr Hand in EPL, the loot are somewhat better than deadwind pass orges ( 20% better imo ) but the enemies there are tougher and it's crowded with other farmers. Hint : it pays to know the chinese language.
You can start going to those instance ivelliis mentioned at level 57. Also, don't passed up the opportunity to join a ZG pug ( yes, ZG is pug'able

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That's just about it I think.