A great article, and Valve does this so very well. On a related note, Valve launched the 'Perpetual Testing Initiative' for Portal 2 yesterday ( http://store.s

A great article, and Valve does this so very well. On a related note, Valve launched the 'Perpetual Testing Initiative' for Portal 2 yesterday ( http://store.steampowered.com/app/620 http://store.steampowered.com/app/620 ) , which is an amazingly easy-to-use level editor and shared content community, which should add much longevity to the game. People learn to build levels, and get feedback votes from players. The options are slightly limited, but you can take your level over to the full hammer editor after. An interesting move in the context of the article, essentially teaching their community to be makers.