I've noticed as I go through my adventures that I have an awful lot of situations where I use Observation or, to a lesser extent, Intuition to resolve things. The group notices an ambush, spots a secret passageway, notices a strange smell, etc.
The issue I have is that I am concerned about making one ability "required" for my adventures. Currently, we have a Roadwarden who is very skilled in Observation; her character ends up finding a lot of the clues while the other players fail on checks again and again. I through some easy checks out there as well and have those players roll first in order to give them a sense of accomplishment, but I'm looking for solutions to this in order to bring the focus on some of the other abilities.
It may just be a matter of Observation being an obvious skill to find uses for, but I want to encourage diversity rather than the cookie-cutter Observation/Intuition/Weaponskill character.