Sorry about that one, readers. Sega and Platinum Games have released a demo for Bayonetta on both Xbox Live and PlayStation Network…but only in Japan. It's likely the companies will deliver a similar playable demo before the game's release over here in January, but right now, you'll have to jump through some hoops in order to play the game.
It's not impossible to download demos from each machine's Japanese marketplace, but it might take some message board scouring to find out the best way to pull it off. If you manage to get the demo onto your console, though, let me know what you think of the game!