In case someone missed it, the game everyone is talking about; Minecraft.
This game just amazing and super-addictive. Anyone else than me actually playing it? Best 10€ I've spent in some time.
There is a free version that you can build stuff in, but the alpha version with survival mode makes it a million times more fun as you have to gather all the materials for yourself, craft tools and build stuff. I'll give you a few videos on it if you are wondering what it is all about, starting with an EPIC fan made trailer.
The verification system got overloaded due to the popularity. This means you can play the alpha version for free until it's fixed. http://www.minecraft.net/Some gameplay:
There are many, many more videos in the series on his channel.
Some awesome stuff that can be done (these are done in the free version with unlimited material, it can be done in alpha with enough time as the world is infinite):