I've read a post about some kind of hack where a character was gaining 29 levels in a crafting class in less than a minute (maybe even all levels from 1-50).
There was a screenshot with timestamps in the chat log too. That was a few weeks ago.

When I saw this I felt like all the time spent getting my crafts up since v1.0 beta was a waste of time, when cheaters can do the same in minutes and then destroy the economy.