We announced the PSN and XBL versions of the Batman: Arkham Asylum demo were available last evening, however the PC version came a little later, today.

Grab it from the official website below or either of the sources to your right). Be warned it's not exactly optimized for size...

Note the PC version's launch has been delayed to September 15 for North Americans and September 18 for Europeans.

The Batman: Arkham Asylum demo has been released on PSN and Xbox Live today and, if gamer impressions are anything to go by, it's definitely worth checking out for both Batman fans and non-fans alike.
Discuss the demo in the Batman: Arkham Asylum forum.

If that wasn't enough, a bunch of new trailers have also been released. Go to the source for the new videos.

"The consumer demo for Batman: Arkham Asylum, published in the United Kingdom by Eidos Interactive, will be available for the Xbox 360, PLAYSTATION 3 and Games For Windows LIVE worldwide on August 7th, 2009, it was announced today. The full game will be available at retail stores nationwide in the United Kingdom beginning August 28th."