The February 16, 2007, issue of Science has the first peer-reviewed paper on MRO results: a HiRISE-related paper that also made the cover.

Fracture-Controlled Paleo-Fluid Flow in Candor Chasma, Mars
Chris H. Okubo and Alfred S. McEwen
Science 315, 983-985 (2007)
Abstract
Full Text
Supporting Online Material

Note: the three links above will become active in a couple of hours after the embargo is lifted.

For non-subscribers to Science, I'm not sure if Chris Okubo is going to make the paper available on his publications page but you may wish to keep an eye on it.

NASA Mars Orbiter Sees Effects of Ancient Underground Fluids
By Lori Stiles
University of Arizona Communications
February 15, 2007

Note the link at the lower right: "Related Web sites: HiRISE special"

Underground Plumbing System Discovered on Mars
By Ker Than
Staff Writer, Space.com
posted: 15 February 2007
02:00 pm ET

Underground pipes channelled water on Mars
19:00 15 February 2007
NewScientist.com news service
Kelly Young

The Planetary Photojournal has the imagery supporting this paper.

See also the EurekAlert release (Orbiter provides new hints of past groundwater flows on Mars) from the "The New Mars: Habitability of a Neighbor World" Symposium at the 2007 AAAS Annual Meeting being held in San Francisco.

The full version of this release is now up.

See also this link.

Fascinating and brilliant news! But I wonder who's going to break the news to the researchers that the only fluid that could percolate through the ridges near Soup Dragon is not water, but blue string soup...?

Haven't had time to read all this yet but I notice the New Scientist article linked in post 3 mentions evidence of fluid flow identified in Victoria Crater in the form of cemented fractures in the eastern rim rocks. Has this been mentioned before?

threaded with blue beads of course . . .

For those with access to Science, the paper and SOM are now available for download, though I believe the latter is freely available to non-subscribers.

The restrictions on the link to "HiRISE special" have now been lifted. Check out the anaglyphs and the flyover movie.

The Okubo and McEwen paper is now available (349 Kb PDF).

Also, for those who don't have access to some of the hard-to-obtain journals, note that Okubo has made available a few more of his recent papers via his publications page.