If you want to stay "in-house", a writeup can now be found on the site at http://www.eqtraders.com/quests/pop_planartravelersmanual.htm
There are three tradeskill quests that you are given only after you obtain the planar traveler's manual, equip it, and hail certain NPCs. What little information we have on these can be found at http://www.eqtraders.com/quests/pop_aftermanual.htm
I've also got a writeup on a PoK fishing quest and a foraging quest from Plane of Knowledge in the quests section of the main site.
There are three tradeskill quests that you are given only after you obtain the planar traveler's manual, equip it, and hail certain NPCs. What little information we have on these can be found at http://www.eqtraders.com/quests/pop_aftermanual.htm
I've also got a writeup on a PoK fishing quest and a foraging quest from Plane of Knowledge in the quests section of the main site.