How can wikis be used amongst coworkers in a school?

As I sit here and think about how wikis can be used between coworkers in a school setting, the possibilities are endless! My first thought is how amazing it would be to have a wiki site created where teachers could add lesson plans, activities, and materials by objective. I can see this being extremely beneficial to teachers. As educators, we are always looking for new and innovative ideas to use with our students. Imagine what this wiki site would look like if every teacher in the county put one idea per objective on the site. Teachers all over the county would have endless ideas to integrate into their instruction. This idea can also be taken to the team level. Grade level teams within a school can create a wiki site where they can share resources as well. I have a friend who uses a wiki site with her team to take minutes for team meetings. Teachers can alternate who will take the minutes for each meeting, and can add to the wiki site each week from their own computers. I would love to hear how you have used wikis with your coworkers!