"The key is to produce something that both pulls people together and gives them something to do... I don't have to control the conversation to benefit from their interest." Henry Jenkins
And as an example...
This was created by a chap called Faris Yakob (you should read his blog incidentally) who has his head screwed on the right way when it comes to emerging digital culture. I found this video as part of one of his recent presentations.
A nice ambient campaign from the IFAW (International Fund for Animal Welfare) highlighting illegal souvenir trading by placing 200 cardboard turtles on the beach at Bournemouth.

You know I'm a big fan of the Trendwatching briefings. This month's release is no exception, although slightly different in content - it provides numerous examples of innovative businesses rather than discussing a trend per se. Well worth a read.
Click here for a PDF
Or here to view online.
Interesting article here about what's developing in mobile advertising, unsurprisingly heavily featuring the iPhone.