We use it for our administration work. After the first whats-this???-faces, more and more people are enyoing this wiki.
I'm so convinced about the qualities of twiki, i even use it for my private site now.
Personal Preferences (details in TWikiVariables)
Horizontal size of text edit box:
Set EDITBOXWIDTH = 70
Vertical size of text edit box:
Set EDITBOXHEIGHT = 17
Optionally write protect your home page: (set it to your WikiName)