I highly recommend MediaWiki which is free to download and host on  
your server. Our instructors have found it easy to use and our  
support team at UW Whitewater finds it easy to administer including  
password protection to keep our students personal info safe from  
outside viewers.

Lauren
Lauren Rosen
Collaborative Language Program
University of Wisconsin
618 Van Hise Hall
1220 Linden Drive
Madison, WI  53706

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608-262-4066 (voice)
608-265-3892 (fax)
http://www.uwosh.edu/colleges/col s/clp.htm