Via the ACLU:

The American Civil Liberties Union and the New York Civil Liberties Union today filed a constitutional challenge to a surveillance program under which the National Security Agency vacuums up information about every phone call placed within, from, or to the United States. The lawsuit argues that the program violates the First Amendment rights of free speech and association as well as the right of privacy protected by the Fourth Amendment. The complaint also charges that the dragnet program exceeds the authority that Congress provided through the Patriot Act.

Also:

Yesterday, the ACLU and Yale Law School's Media Freedom and Information Access Clinic filed a motion with the FISA Court, requesting that it to publish its opinions on the meaning, scope, and constitutionality of Patriot Act Section 215. The ACLU is also currently litigating a Freedom of Information Act lawsuit, filed in October 2011, demanding that the Justice Department release information about the government's use and interpretation of Section 215.

Also big news: The FISA Court has published its first public docket -- of an EFF lawsuit seeking disclosure. Pleadings are here.