Some Wikis to visit

1. Bud Hunt's Wiki: Created by Colorado teacher Bud Hunt and many educator-collaborators.
2. Educational Blogging Wiki: Supports the educational uses of blogs and contains links to student and teacher blogs.
3. High School Online Collaborative Writing: Features the collaborative writing of various high school students.
4. Library Success: A Best Practices Wiki: Smart practices for libraries and the issues that impact them.
5. Westwood Schools Wiki: An online space for Westwood Schools' students that includes a variety of student projects, including an insightful analysis of Web 2.0 tools.
6. PodcasterCon Wiki: Supports collaborative preconference planning for PodcasterCon 2006 and hosts content about each session that participants can add to.
7. SwarmSketch: Just for fun: This site allows you to contribute a single line to a drawing and then vote for the inclusion of other lines in the drawing.
8. Warlick's Wiki: A wiki designed to support the presentations of education guru David Warlick, who speaks at Technology & Learning's Tech Forum events.
9. Wikibooks: Collection of textbooks that can be edited by anyone.
10. WikiVille: A wiki where students can build stories about where they live.

To know more about Wikis

What wiki tools are available?

PBwiki: This site says creating a wiki is as easy as making a peanut butter sandwich, features an attractive design, an easy-to-use interface, RSS feeds, and the option to password-protect content. PBWiki supports itself through Google AdWords. More robust features such as advanced permissions are available for a monthly fee ($5, $10, or $25 per-month options).
Wikispaces: Wikispaces is an outstanding tool that's free for K-12 educators, and more important, it's free of advertising. The education-specific pages are private so only space members can edit them. With its easy editing interface, Wikispaces is a good choice for teachers getting started with wikis.
EditMe: This is a full-feature wiki interface with multiple levels of authoring control and viewing (such as public view, public edit, administrative edit, and more) through password protection. The advertising-free wiki pages offer easy editing through a WYSIWYG interface. EditMe's cost-per-month starts at $4.95.
WetPaint: A new player in the wiki hosting environment, WetPaint offers a simple editing interface, password protection for registered users, RSS feeds for content distribution, and a unique moderator option that lets individual contributors monitor wiki content and user behavior. WetPaint's free wiki pages contain Google AdWords.
MediaWiki: MediaWiki is a free server-based wiki tool. Because it's hosted on a school's internal server, no ads are present. Although its page-editing tools are somewhat challenging to learn, MediaWiki offers a complete solution for schools to create a wiki environment tailored to their needs.    
http://www.techlearning.com/article/6164

How do wikis work?

A new user begin a wiki about a particular topic udating new content and other people can coment on it

Wikis The New Way

Aims

Students can use wikis as platforms for collaborative problem solving; group laboratory reports;
Wikis are handy tools for planning workshops or conferences. Trainers can post documents and other resources at the wiki prior to the workshop and have participants create and post their own notes during the event. Later, participants can return to the wiki to further reflect on what they've learned.
Administrators can leverage wikis to allow teachers, technology staff, and others help create and edit policy documents.

http://www.techlearning.com/article/6164

Vandalism

They consist of making edits erasing important content, introducing mistakes, added inapropiate or offensive content

some examples:

• to talk about any religion
• login material that violates copyright

       solutions:

• block the user name