[johan osterman]

Originally posted by Rollo:
well, a new thing would probably be the water cult (available to all nations, I think), which lets you enter water provinces with your holy troops if you have a positive dominion there.
I am sure there is more, but I am not so familiar with the differences between dom1 and dom2.
Rollo

There are a few other non nation specific themes that have dominion based effects as well, such as the golem cult wich gives a hit point bonus dependent on dominion strength to friendly constructs.