John Bidder, adviser for ICT & Innovation in Bolton Local Authority, set up WikiVille recently - a project largely run by young people who's mission is to paint a picture of life for them in their part of town. School representatives were recruited to run introductory workshops, at which learners determined their own Rules of Engagement.
There are already a bunch of international participants, and the site welcomes learners of all ages and abilities. It would be a really fun way of introducing students to wiki's and global citizenship while covering geography or social science.
I was interested to learn that Lancashire food is considered strange and unhealthy (although the author neglected to say by who) and that mushy peas are known as Lancashire caviar. I also enjoyed the brief list of names for bread rolls in different parts of England - variously called batch, balm cakes, bap, we call them cobs in Leicester.