This is a loose concept, the blogger (Rob Donoghue), uses 4e as an example, but it originated out of a discussion about Dungeon World. The basic concept is to help a DM come up with experience for exploring and interacting with new locations that aren't necessarily tied to defeating monsters, though that can be rolled into the system as well.
This would work particularly well for a West Marches style campaign. Finding and mapping new locations is a major part of this kind of game so a simple way of determining XP for that is useful.
Another useful tool for DM's and their groups. How you give out xp can have a direct impact on the feel and focus of your game, this isn't a replacement, but rather something you can add on to the current system.
Also, it's not directly related to the Dwarven Door Game, but I'm seeing a combination that could be fun.