A few people have been in touch since the workshops and asked for some links to stuff about transmedia/alternate reality games. Here are the links I have sent them to kick things off:http://en.wikipedia.org/wiki/Alternate_reality_game

Bit old now, but great overview from Wired magazine: http://www.wired.com/entertainment/music/magazine/16-01/ff_args

Overviews and reading lists from Henry Jenkins, a leading academic and guru in this field:
http://www.convergenceculture.org/weblog/2009/09/transmedia_storytelling...
http://www.henryjenkins.org/2007/03/transmedia_storytelling_101.html

and the blog of Jane McGonigal – leading transmedia game creater:http://www.avantgame.com

There are obviously loads more – do add any you know of in comments.