This excerpt taken from the PNC 8-K filed Mar 10, 2008.
Effect of the Blackout on Your Investments
During the blackout period, you cannot direct or diversify the assets held in your ISP account. For this reason, it is very important that you review and consider the appropriateness of your current investments in light of your inability to direct or diversify those investments during the blackout period. In particular,
you should note that the blackout period will coincide with quarterly earnings announcements for PNC as well as other financial institutions and public companies, and that stock prices may be more volatile (that is, may go up or down more than usual) during the period following such announcements. For your long-term retirement security, you should give careful consideration to the importance of a well-balanced and diversified investment portfolio, taking into account all your assets, income, and investments.