I know some people get precious about Dark Souls boss spoilers as they want to experience them for the first time in the game, so if that is so, turn back now.
The Dark Souls technical beta is now out there for the lucky few who have been let in, and with that a little footage has been creeping out. TrU3Ta1ent for instance have posted this video of the Dancer of the Frigid Valley, a boss in the game.
The design, the way she moves, the battle, this is all pretty stellar. Take a look here: