Protect the Living
There are very good reasons why the details of living persons should be excluded here. For a start, here in the UK banks and building societies sometimes still use the maiden name of one's mother as an identity check. By publishing a family tree with names of the living on the Internet, we genealogists are handing a wonderful gift to any person unscrupulous enough to use it.
Here is an article with specific reference to genealogists, from which came the logo above:
http://homepages.rootsweb.com/~cregan/privacy.htm
(if this link is broken, please let me know)
