Multiplayer stealth game Monaco is getting fantastic reviews. Looks like the kind of game that will be played for years. Supports local and online multiplayer, I love local multiplayer so I am going to wait a bit till I can get a crew together to play it.
You can purchase it for cheaper than on Steam through their official site (you still get a steam key).
In other news, one of my friends has released an interesting indie game: Music of the Spheres. It’s based around Islamic art and the maths of music. It is pretty original; some of the later puzzles require you to ignore the visuals and simply listen in order to solve them.