[buchard]

What u have to do is:

go to Lauranna Thar'well take this quest "Plants for Zangarmarsh" do it once or twice...u will receive a package of identified plants as reward....open it...and there among other plants should be this item "Uncatalogued Species"
(this item will begin a quest) now....just right click on it...accept the quest(u just have to talk with Lauranna to finish it) this is a repetable quest..so u can just do it over and over...right click..accept finish...right click..accept finish
in a couple of minutes u can raise your rep to max....after that u can buy pretty good rep stuffs from the vendor near there...
This was only tested on burningwow...

[wgn1]

confirmed
found out about it a week ago, couldnt check it on other severs though

[Moonstalker]

Thank you very much for this post, had no idea

[twinkletoes]

oo i did that on wowscape

[Technique]

doesnt work on my server
could only do it twice

[wgn1]

confirmed on wowbeez
gotta restart the quest though everytime(or you wont get the item)