Yes, good idea to keep a low profile. It IS tough with young children who innocently tell the neighbors about Daddy's shelves of food, water and supplies in the basement. Maybe it helps to plan ahead for charitable give/no give scenarios.

Did someone post a link here to this short film, "Old Friends," a few weeks ago?

http://www.youtube.com/watch?v=xPYwmHiseXQ

A few good posts on this topic can be found at SurvivalBlog.com:

When unprepared folks come knocking -

http://www.survivalblog.com/2008/11/letter_re_when_unprepared_folk.html

Preparing charity packets -

http://www.survivalblog.com/2008/07/letter_re_preassembling_charit.html

Keeping a low profile -
http://www.survivalblog.com/2008/02/letter_re_keeping_a_low_profil.html