Hashing passwords is a common way to secure them in a database and make sure that they cannot be read easily.
But did you know there’s a website that reverse engineers the hashes and stores them in a searchable database?
The folks over at RedNoize have created such a site.
Obviously, there’s no better protection than keeping your databases tightly secured – but even so, it may be worth considering putting extra abstraction on passwords – just to make it that little more difficult.