I was looking at cheap services to transfer large files (home videos) and I stumbled across the mailbigfile service. I was checking out the FAQ, which is actually a forum. The first entry I read was very scary.
If you don’t feel like following the link, I will summarize. This user was asking how long the service would retain his file named “ Admission, Discharge & Transfers.doc ” Yikes, this dude is sending his hospital patient data using this free service!
This service does not use any encryption or passwords. It just puts the file in a publicly available web server using a funky web address like: http://www.mailbigfile.com/309744be27e1b1c2800553375d0ca99b/download/826733/will_bellin_2007.png
These are the kind of links that people believe are undiscoverable, but googlebots find them all the time, and then heads roll.