In response to acrosscanadatrails: if you do organise a mapping party, try home education blogs/sites - this seemed influential in the social mix that the Manchester mapping weekend generated with 4 families turning up on the first morning (I believe this resulted from a post on geekup which then got posted on to a home education forum - blackadder perhaps has more details...).

With regard to undergrad geography students, from my experience, only 3 of us (myself with invested interest) attended the mapping party despite constant plugs from 2 of our lecturers/OSM enthusiasts. In this case the beer afterwards is probably still the best ad campaign!

With regard to outdoor clubs I would suggest the Duke of Edinburgh award scheme within the UK - my experience involved (very out of date and in some cases useless!) OS maps.

Caroline

Thank you to everyone who has got in touch (either by e-mail or commenting here) your feedback has been really useful, and helps me form a more detailed picture of online mapping.

Once I am in a position to ask some more specific questions I will post again.

Thanks again
Caroline