Alternate Reality Branding have a page and three videos surmising 42 Entertainment’s 2008 activities, specifically the Dark Knight Why So Serious viral marketing campaign.

Highlights include over 10M unique participants across 75 different countries through ‘eventizing’ the web, for instance the use of cell phones ringing from within cakes in Bakery stores. All in all it kept The Dark Knight in the news and alive and well on the internet for over a year, leading up to the July ‘08 release.

Campaign Overview Video

Comic-con Event Video

Harvey Dent campaign video

Found via /Film and FSR

Just to provide you with a bit of context for The Dark Knight sequel, Warner Bros. have announced that Chris Nolan’s next movie, “Inception”, will be released on July 26th 2010. This falls in direct competition with Marvel’s Thor movie.