Zeewolf: I'm glad I'm not the only one who's addicted... :-)
Yeah. I'm always a sucker for games where you can create things (although I'm generally horrible at creating), and the fact that this actually has gameplay that goes along with it is cool.
Also, I really like how the graphical style (low-res cubes) allows for technology that can't really exist in games how they are now. If would be impossible to implement the randomly generated terrain, infinite landscapes, and dynamic water like Minecraft has with a game that was more detailed due to its relative simplicity.