By the way, this page lets you easily send an email to various SF city government departments by choosing from a scroll-down list:
http://www.sfgov.org/site/mainpages_form.asp?id=18611
Bookmark and use frequently! If you get any interesting responses, please post them to this list. I just sent the following to the Department of Parasitic Thieves (aka Dept. of Parking & Traffic) and to the SF Public Library: