Hi there, 
There is a nice overview at this address:
http://www.utc.edu/Administration/WalkerTeachingResourceCenter/FacultyDevelopment/CooperativeLearning/index.html 

as well as some ready to try structures and techniques
emma

Emma Bourassa
English as a Second or Additional Language/ Teaching English as a Second Language Instructor
ESAL Department
Thompson Rivers University
900 McGill Road. P.O. Box 3010
Kamloops, B.C. V2C 5N3
(250) 371-5895
fax 371-5514
ebourassa at tru.ca