This still is a huge concern for us web app developers. Most people re-use their email addresses and passwords across multiple sites. One breach at one internet

This still is a huge concern for us web app developers. Most people re-use their email addresses and passwords across multiple sites. One breach at one internet company affects all the others. IMO, password reuse is the #1 web application security problem in the world right now, and there's very little in the way of accepted industry standards to mitigate it.