I put a couple of pictures up on flickr at one point and then got concerned about the security/safety/wisdom of it. I am wondering how many other people use any of the online picture sharing sites. Thoughts?

Well no place on the net or conected to the net is truly safe. I have posted some pics on cherylstalk. You have to be a member to view.
If I was going to use a site like flickr. I would use some of the tips from this article at this address.
http://globalvoicesonline.org/2005/04/13/a-technical-guide-to-anonymous-blogging-a-very-early-draft/

I would hide my IP address at least.