MM, someone on your board must be a practicing attorney (I am a lawyer--gosh, can't you all tell from my recent posts how argumentative I can be?--but don't practice and don't know ANYTHING about copyright issues) who could tell you what references you should check about using members' words.
I know other sites do similar things...my husband is actively involved in a listserv on medieval genealogy (don't we have odd interests?!) and the guy who moderates that publishes a book each year with tons of excerpts from the postings. There have to be rules about it.
In my field (psychology), there are strict guidelines about what counts as "publication" of our work (because we're not allowed to submit things to academic journals once they have been published elsewhere) and when your work is protected.
I bet nobody would change a thing about their postings if you had a message like that. People here are generally very civil and thoughful and, when posting negative comments, usually give lots of explanation rather than just "Hostal XYZ is horrible!"
Ooh...voila! Hooray for Google!!
http://bailiwick.lib.uiowa.edu/webbuilder/copyright.html http://www.fplc.edu/tfield/cOpyNet.htm http://www.cyberspacelaw.org/dogan/dogan4.html More than anyone ever wanted to know about copyright, fair use, and other issues!!! THIS is why I don't practice law. No amount of money will get me excited to read all that junk!