• March 11, 2008

The historical series premieres on Sunday.

The "Power of the Letter" campaign is meant to align with Adams' rep as having been a prolific letter-writer. Visitors to poweroftheletter.com can create and customize greeting cards with quotes from John Adams and his wife Abigail. Consumers will be able to choose from six designs featuring poignant quotes from the couple. The cards, created by the Postal Service's online retail partner Cardstore, are available through March 30.

Visitors to the site can also enter a sweepstakes to win a VIP trip for four to Colonial Williamsburg, which served as the location setting for many scenes in "John Adams."

The effort includes promotional messages on post office receipts. "Let us dare to read, think, speak and write" will be printed on about 3.75 million receipts per day, directing postal customers to the web site.--Karl Greenberg