As the NY Times continues to facilitate the illegal leaking of classified information, thus degrading the ability of the United States government to protect Americans from foreign terrorisim, the blogosphere is repleat with legal experts who can speak elequently on the legality of the program, and are clearly a much better source for information than the hideously biased MSM.
Some excellent sources:
Baseball Crank (practicing attorney)
Volokh Conspiracy (via Baseball Crank)
Cass Sunstein (via Baseball Crank)