As part of my continued Sunday afternoon's hunt, Alex Savage put me onto wikispaces. Cheers, Alex! I'd tried to investigate wikis over the Christmas period, but without really knowing where to look, or how to do it.
However, it really is such a simple, effective idea, for teachers to be able to put a thread on-line and then allow the pupils to expand upon it- not just for MFL, but say for primary literacy (yes, that was Ali, my girlfriend's contribution, cheers luv), or huge numbers of other uses.
However, my ideas for this remain reasonably limited- so if anyone else has any experience with it, please please pass on those wise words.
So here it is- www.edgehill-spanish.wikispaces.com