MoP introduced a large number of items (of varying quality) that provide a certain bonus to your professions - usually the gathering ones.
I mean the kind of bonuses that are truly useful, and not the usual "+5 skill to engineering" ones that are rather dull.
For example there is the Ancient Pandaren Mining Pick that improves your Mining - or the Mist-Piercing Goggles that improve both Herbalism and Mining.
Since the effects such items have on your profession's performance is quite noticeable, i am very interested in acquiring them all.
However there is no simple way to look for them over Wowhead, aside from going item-by-item which would take eons.
So i wanted to ask you, fellow wow players, what other items do you know of that provide a boost/benefit to your professions?