I too love the worldbuilding part. I like the idea of having other events unfold in a dynamic world that is not centered around the PC's. And because of this, I'm currently spending alot of time building a campaign world with my friend Jim who is currently overseas. This gives us something to work on, and keep us busy until we finally get to start playing again.

Our world map is going to be very detailed, and showing pretty much everything in the world when zoomed in enough. By adding all of these details it will give the players less of an impression that the world is just thrown together. Besides the highly detailed map, we're also building the world from the ground up:

World Map (actually just regional.. but the npc's think it is the world map.. leaves room for future expansion)

Kingdoms/Empires
- their histories
- their politics
- their imports/exports
- religions
- prestige classes/ class restrictions

and also other areas outside the political kingdoms that can lead to many many game sessions.