The video that we watched was about the creation of a collaborative wiki for teachers. The teachers wanted a place to share their creations (lessons plans, activities, ressources) with teachers of other districts or even of other states. They created a wiki where they could post their ideas and share them to the public. First only teachers from the same school could edit the wiki but now even other disctricts can add their creations to the wiki. It becomes a great ressouce for teachers and can really help for the preparation. It is a good way to know how it works it other schools too.
I think that a collaborative wiki among teachers is a very good idea! It can really help teachers in sharing their ideas. It can also help having feedback on your creations. If someone edits your lesson plan, you can see it another way and see the improvement. Also, any teacher can use it easily. As Sze (2008) says, it is easy to learn and to work with a wiki. This way, you can have a lot of teachers that contribute to the wiki and this gives a lot of different views and ideas. It makes a diversified collection of ressources for teaching.