Skill challenges are one fourth edition concept I really like. The execution in the rules as written is a little lacking, but having a set framework for determining the difficulty level and appropriate xp reward of a roleplaying encounter is a simple yet very elegant idea. The fact that the framework encourages all players to participate, and not just the one whose character has the highest Charisma or best Diplomacy bonus, is icing on the cake.

The mathematical issues need to be addressed, but the concept is golden.

I need to see /try some skill challenges before I can truly ‘get’ them. Keith’s article helped a lot.

Plus role playing skill challenges opens the door to awesome Skill bonuses.