A wiki can be modified, even with material posted by others, on a collaboratively developed website.
What are wikis? An explanation for teachers
What is the difference between a wiki and a blog? (From TeachersFirst.com)
A blog, or web log, shares writing and multimedia content in the form of “posts” (starting point entries) and “comments” (responses to the posts). While commenting, and even posting, are open to the members of the blog or the general public, no one is able to change a comment or post made by another. The usual format is post-comment-comment-comment, and so on. For this reason, blogs are often the vehicle of choice to express individual opinions.
A wiki has a far more open structure and allows others to change what one person has written. This openness may trump individual opinion with group consensus.
Wikis in Plain English--a fun video to explain wikis
Wiki Collaboration - video: Why wikis trump email
50 Ways to Use Your Wiki
50 Ways to use wikis to make your classroom more collaborative and interactive
Wikis vs. Blogs A humorous debate between Kennedy and Nixon
Link to A Brief History of Wikipedia Video
Turbo-Charged Wikis (an article)
Highcrest's Use of a Wiki: Equipment Sign-up
Central School's Sharing Place (Password Protected)Examples of Educational Wikis (a collection of several wiki examples used at different levels of education)
Highcrest's Sharing Place (Password Protected)
WPS39's Smartboard Wiki (Password Protected)
WPS39's DI Institute Wiki (Password Protected)
Wikis and Library Media Centers
Other Samples of Educational Wikis