How+can+a+wiki+help+my+teaching?

Use a wiki to collaborate with your colleagues.
Here's an example! Make headings / new pages for each unit Brainstorm lesson plan ideas Add on to / edit colleagues' ideas Share / allocate resources Upload files Pose questions / answer colleagues' questions

Create your own mini Wikipedia as an assessment or to review for a major assessment
Given any topic (ie The Civil War), students can be assigned to write subpages (ie generals, battles, uniforms, etc.) Here's an example by Robyn Wolfe: http://21stcenturymathematicsproject.wikispaces.com/

Have students use wikis to compile a list or brainstorm content
Students can read the list and add more. You can post links to useful resources and students can add additional ones they find. You can have a wiki page called "homework for my class" and students can update it nightly so you don't have to. Students can post questions they have and answer those of their peers. Teachers can see student contributions prior to classroom activity and can use this to encourage students to share during discussion.

Manage class discussions on the message board
Questions and discussion prompts can be posted by the teacher and students Students respond to each other in conversation threads, which is more organized than a group blog Administrators can easily track and delete inappropriate posts Click on the "DISCUSSION" tab (above) to get started!

Have students use wikis to peer edit writing assignments
Students can edit each others mistakes. Students can make suggestions for rewrites. Authors can track the changes their editors have made through the "HISTORY" tab (above).

Have students use wikis for group projects
Students can collaborate without having to find common meeting time. You can track each student's contributions through the "HISTORY" tab (above).

Have students use wikis to track their learning
Students can be assigned to maintain their own wikis to which they post answers to all essential questions throughout the year. Parents and administration would be HIGHLY impressed. "Publishing" their work raises students' level of concern for quality in their work.