Dr Nicola Pratt, at the School of Political, Social and International Studies, the University of East Anglia, has a very interesting experiment going on:
Students are being encouraged to improve their research and writing skills by editing Wikipedia entries.
School children too can benefit from such an exercise, even if all they did was to edit the material and make it easier to read.
A wonderful idea to motivate the students by engaging them in something useful that would persist after their assignment is graded. And somebody is sure to come along and improve their entry. Which is more learning for the student!
I made some "original" contributions to wikipedia years ago, and it is amazing how those articles have grown to their present authoritative and better finished forms.