How about the folks at Scientology??? I hear that is pretty big around here. (just kidding, just kidding)
I spent most of yesterday copying and sending email to various "biker" groups. I know I sent out at anywhere from 25 to 50 to them, plus a bunch of other different organizations - a volunteer group in Orlando, American Legion president, etc, and I advertised in Craig's list a few times. The only response I got back was from a woman in Port St. Lucie who responded to my Craig's list ad and said she and her daughter were going up today to help the search team today and that she would email me and let me know how it went.
Then, now get this, I get a reply from someone else regarding my ad in craig's list and her response was "Your ad is a little late. Don't you know, they found Caylee on Saturday in the trunk of Casey's car."