Five of the six papers published in support of yesterday's Mars water announcement required a paid subscription to Science to read. Citing Title 17 of the U.S. Code, which states federal works are not subject to copyright protection, Berkeley biologist Michael Eisen decided to make them freely available on his blog. Viva la revolución.
I'm not sure I really agree with him in blaming NASA for this, or the scientists, really - Science is one of the biggest and most prestigious science journals around, so it fits the profile of an announcement like this. IMO, we should be criticizing Science's decision to put the papers behind a paywall and the general absurdity of science publishing, not the scientists or NASA.