"There is no central governing body behind this," said Tim Phillips, president of Americans for Prosperity and one of the movement's many informal leaders.

"It's a genuine grass-roots movement, so I think you will continue to see an array of grass-roots protests giving voice to their concern that they have of losing their freedom, specifically their economic freedom."

"In some areas we've noticed tea party activists are getting involved in local government in school boards, town councils, and a lot of national Web sites are popping up to organize for another massive tea party day push," said Adam Bitely, director of new media at Americans for Limited Government.

The Web sites have names like http://teapartypatriots.org/. Mr. Bitely runs http://www.netrightnation.com/, which aggregates all of the Web sites and reports on the movement's progress. "It's kind of a general post on what everyone's doing," he said.