Ahh wikis. Wikis are GREAT. We started a class wiki earlier this year and it has been a great asset to our class. The students have really taken charge in posting class information and updating our info. It has been helpful for the parents as well because they can clearly see what is happening in class.
In my class I give students the opportunity to pretest and test out of upcoming units. If a student can pretest with 90 or above they have the option of then completing an alternate independent study project. We created an independent study wiki for those students to ask questions and post their finished products.
As a school the staff created a wiki where our principal can post updated information, articles she enjoys, and lots of other stuff.
My husband and I even have a "family" wiki. It's great that both of us can update it from any computer. We make our weekly menus (and sometimes link to recipes), shopping lists, and to do lists. Very helpful. Surely there will be something new and better by the time we have kids but I'm thinking if I had kids I would have section for each child to keep track of schedules, and other needs.
These are all made using PBworks, and I love that just last week they introduced nesting folders. Now you can have a folder in a folder! I think this will really help with organization and make it easier to navigate.
Our family wiki is members only :) but below are links for all the others I mentioned.
Independent Study Wiki