I often see a lot of teachers assigning group assignments. Google Docs would be a great tool for collaboration between group members and help put their paper together. Once the group is done with the group paper, they can share their findings with the rest of the class on a wiki.
I’ve always wanted to an assignment where students will create wiki pages where others can edit it. Once a student creates his/her wiki page, a second student will edit the page and input some errors. A third student will review the page, locate the errors, and locate sources that will explain why they are errors.
Students will hopefully pick up some very useful information literacy skills.