The overnight Daily Digest from Securosis (visit here to sign up - always a good read) contains an interesting theme on ticker symbols, and posits the effect that previous security breaches exert on company stock price. In this case, a positve effect...

And, while on the previous subject, the ticker symbol HACK is presented, and speculation of adding other security related tickers. The HACK ticker symbol represents an Exchange Traded Fund (ETF) (in this case, an investment vehicle targeting the so-called cyber-security realm and originally created by PureFunds).