(above) The Bowler hat of Bolivia
(above) El baile de la Jota, Espana

The WIKI and its use in the classroom:
-Since the Wiki is of a collaborative on-line nature and can foster a sense of responsibility and community, I would try a class 'cultura' project: Students would be put into smaller groups (4) and they would be responsible for contributing information on a specific cultural practice/element of their choice from an assigned country - to avoid repetition. This repository of information, built by the students (cross-checked by the teacher...), could then serve as a group presentation to the class at the end of the semester.
Potential ideas:
-Baile de la Jota, Spain
-Los tejidos de Guatemala
-The bowler hat and tradition of Bolivia
etc...
Considering there are many organizational/grading/individual participation wiki factors to think about...this would hopefully be a good starting point to test wiki boundaries in the L2 classroom.
I think that grading of the final group presentations and student group member evaluations would be an integral part of the success of the wiki project.