I have used ProjectForum for a year and a half to run a university research group and micro/nanofabrication facility. I had looked for nearly 2 years for an easy to use, easy to install & maintain, platform agnostic, web-based application to facilitate communication and documentation for a wide variety of projects. We use ProjectForum for everything from running meetings, planning and documenting experiments, logging equipment problems, and collaborating with people in other groups. Moreover, ProjectForum automatically becomes an excellent corporate memory, which is important when you have people moving in and out of a group. New group members have no problem learning to use it. Personally, I think spending 30 minutes with the manual is time well-spent in order to access the full power of ProjectForum. I have shown colleagues how we use the package and in every case they have been astonished at the quantum leap it provides in organizing a group to make it effective.

If you are looking for an easy to use wiki package that is trivial to install and maintain and yet is powerful and full-featured, this is it.