If you do the quest 'The Ashtongue Corruptors' (http://www.thottbot.com/?qu=10685)

You can very easily level your weapon skill since you have to kill these guys who are invulnerable until you destroy there totems so you can easily just let your character attacking them while you do other things around the house or whateva

After doing this a few times I have found the Corruptor of Air (57,74) to be the best because there are no surrounding mobs.

NOTE: this is only for ranged weapons…if you stand far enough away nothing will aggro.

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