[DarkRanger]

My suggestion:

Ohgma's Encyclopedia of Thay
Frustrated by the terrible disorganization of libraries throughout Thay which made it next to impossible to research simple facts and tidbits of knowledge, an acolyte of Ohgma compiled this handy reference tome.

+5 Lore
3x/day Allows User to attempt a Research check as though in a library to obtain Research Notes for quests given by NPC's, bypassing the need to rest between each of these three research attempts.
Weight of item: 10 lbs. (or maybe even 15 lbs.) Since a large tome shouldn't be light.

My vote for best suggestion. Useful without being overpowering, and not another combat related item.