Skill checks and immersion in modern D&D

Another *heads up* post. A couple of weeks ago Mike Mearls posted up an article discussing the differences between old school and modern D&D regarding skill resolution and immersion in the game. Mearls discussed how in old school D&D players had to be more interactive in the game world when searching etc., whereas in modern D&D what's needed is a simple Perception check, or so it seems. He offers up some insight on how to make skill checks in 4E more interesting and immersive ala old school D&D.