Troll Rep

[Wogan]

You could also do this while simultaneously improving your argent dawn or timbermaw reputations by killing undead in the plaguelands or furbolgs in felwood, respectively.
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This, combined with buying lots of cloth from the AH, is what I did with my UD mage to get a raptor. Of course, this is made a lot easier if you get an epic drop while grinding like I did. Undead look awesome on a raptor though, it's definately worth it :)