Wikis

Hello,
One thing I have been using is Wiki sites. The students can easily collaborate, edit, and reedit content that they or their peers have posted.

There is an LHS Wiki that is only available inside of LHS.
Check out the Cards page.

my personal wiki lives at JS Wiki.
Check the Math page.

You can get free wiki of your own at pbwiki.com or use one of the above wikis. The choice is mostly about access. Do you need your students to have access at home? Are you going to use the wiki with students or just among teachers for collaboration? The answers to these questions will help you decide on the way you set up your wiki.

You can also post images, files, movies on your wiki :>).

This video explains simply a wiki in plain english (~5min).