Never thought about this before -- the many people that publish online geneologies, and that collaborate on building family trees, are making it very easy for identity thieves to get very specific and personal information about you (far more than your mother's maiden name, although that alone is very useful). 

But the basic rules still hold.  Publishing info to a large, unsecured population is always dangerous and requires a very close examination of the threats.  The web brings us far closer than we would like to the bad guys of the world. - Scituate Mariner - Opinion & Letters