The second half of your question is a bit more challenging. Searching systems for the presence of sensitive data...
(such as credit card numbers or SSNs) is a hot topic these days. Given the recent spate of high-profile data security breaches, organizations are keen to secure known stores of sensitive information, as well as ferret out any dangerous unknown goldmines. There are open source security tools to assist with this task, like Spider from Cornell University. The downside to any of these tools is that they're bound to have a high false-positive rate, and the only solution is spending time analyzing log files.
Dig Deeper on Data security breaches
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