Terraria updated today adding a ton of new content, including new NPCs, monsters, bosses, items, biomes and pretty much everything else.
The full changelog is here: http://www.terrariaonline.com/threads/welcome-to-terraria-1-1.64684/
I also have a server up right now, with the same IP as Minecraft.
And on top of that, Terraria is 75% off today! Do any of you not have the game? I will happily buy it for you as a holiday gift.