Sony Online Entertainment has released a short video highlighting some of the things that players have been building and discovering in Landmark. Also, today SOE officially opened submissions for its "Landmarks of Landmark" competition, a challenge that offers the chance for some builders to have their creations prominently featured as permanent additions to the online game world. More details on that can be found here.
In case you don't know, Landmark is a persistent world where players can claim a piece of land and start creating voxel based structures using the same tools used by the game's developers. Some of this content can be monetized and sold to the community for real-world money.
You can learn more about the game by checking out SOE's handy dandy FAQ.