FreedomShare is a great way to create a "wiki" for sharing text, links, and images. It reminds me a lot of Wikispaces w/out the ability to have subscribers to your page. However, you can click on advanced options and make the page public/private w/ the ability to allow comments.
I highly recommend checking out FreedomShare to introduce the 21st Century concept of wikis by clicking here!!!
Thanks to Larry Ferlazzo's wonderful blog for the tip!!