- The document is a letter from the Chief Executive Officer of Merck & Co. inviting stockholders to the company's 2006 Annual Meeting of Stockholders. - The meeting will be held on April 25, 2006 at Raritan Valley Community College in New Jersey to elect directors, ratify auditors, and vote on stock plans and shareholder proposals on the agenda. - Stockholders are encouraged to vote by proxy, either by returning a signed proxy card, voting by phone or internet, or voting in person at the meeting.