In previous editions of D&D Perception was broken out into separate skills for spot and listen. In 4e, Perception is just one skill, essentially a catch-all for five senses. I think this is a huge improvement and opens the door to possibilities. With that in mind, I’ve come up with some alternate uses for Perception.
This skill is not, and should not, be limited to just what you can see and hear. You may not have as many opportunities to use Perception to determine smells, tastes or tactile sensation, but it shouldn’t be ruled out if you come up with a creative use for the skill.