Julie-
The initial question/suggestion was to place a visible advisory that the wikipedia contains information that some people might find objectionable.
The very first sentence of the very first page of Wikipedia reads:
"Wikipedia is a multilingual project to create a complete and accurate open content encyclopedia."
complete accurate open encyclopedia
In my opinion, this is both more honest and more tasteful than any disclaimer could ever be. Regardless, Some people have created the page
http://www.wikipedia.org/wiki/Wikipedia%3AContent_disclaimer
which is linked from
http://www.wikipedia.org/wiki/Wikipedia%3AAbout
I don't like this very much, but it is a compromise I can live with.
Regards,
Erik