] The National Do Not Call Registry will soon be open for
] business, putting consumers in charge of the
] telemarketing calls they get at home. The Federal
] Government created the national registry to make it
] easier and more efficient for you to stop getting
] telemarketing sales calls you don't want. You will be
] able to register online or by calling toll-free from the
] number you wish to register. Registration is free.

You can start adding your numbers to the do not call registry in July!

Federal Trade Commission - The Do Not Call Registry