There hasn't been an entry for a while, so I figured I'd take the opportunity to pimp Dreamfall, the sequel to The Longest Journey.
Simply put, it's one of the most amazing looking game I've played recently, plus the music is great and the voice-acting is absolutely top notch. There's not as much puzzle solving for an adventure game as others have, but the story and plot is pretty much the main draw.

Just to showcase the graphics and music, I put together a little Video (22mb) for you to enjoy. There's no spoilers, as I mainly just used bits and pieces of various segues, transitions, and cutscenes. The song is "Be With You" by Even Johansen, which was made just for the game.