Any system that takes advantage of these odd skills helps. For example, The Player Government System requires at least 40 Forensic Eval to place a city stone.
Taste ID, you could design a system of taste-testing for Lord Brit....random chance to be poisoned or something.
Begging, I always thought it'd be nice if you had NPC beggars that you could give things to and get tips. However, on the flipside, if a player were to use begging on a certain type of NPC, they could get dungeon tips, treasure locations, quest tips, etc.
You know, you hear stories of people camping out somewhere and almost being attacked by a ______....how about a "random encounter system" only for players that are camping? Bandits raid their camp for example, or maybe part of a quest is the player has to camp out and wait for something to happen.
Herding, heh. Little Bo Peep....I'm thinking a farmer you can turn herds of ____ in to for rewards.
Tracking is already fairly useful for griefers at least, but I think more in-depth tracking might be more fun. Where you'd go on a quest to hunt down creatures and you start at their last known location and you might wind up tracking them across several maps until you find them.
Detect hidden would be good if you were a paranormal investigator