What exactly is a wiki?

Why should I have one or encourage teachers to have one?

According to Dr. Scott McLeod, founder of CASTLE. Plus, here's a little more about wikispaces.

A NYC School Saves Time and Money with Wikis

Steve Cohen and the Allen-Stevenson School in Manhattan use wikis to save time and money as they coordinate their parent-teacher conferences. They find that using wikis for these conferences eliminates lost notice slips to parents, phone calls to reschedule, and confusion about times. And getting the parents and teachers up and running with wikis is much easier and less expensive than using other coordination software.
Read on to see why they have gotten a great response to their wikis.

It's Tricky...