This is a majorly important result if verified. Maybe we should call Greg Orme to annotate the images for us!
It is curious though that the authors argue against their being due to liquid water because of their closeness to the equator.
Most people would argue the opposite at least in regard to competing CO2 models. Nick Hoffman's model requires such flows above 30 degrees latitude to occur during prior obliquity periods.

Another region I would to see searched for are those that show forms that seem to have features in common both with the gullies and with the dark streaks on Mars. They are like the gullies in that they have a depth to them, but they are like the dark streaks in that they have digitate ends. In regards to their being formed by liquid water it is notable they occur in a region of recurrent near surface fogs, Noctis Labyrinthus:

From: Robert Clark (rgregoryclark@yahoo.com)
Subject: Mars gullies near equator?
Newsgroups: sci.astro, alt.sci.planetary, sci.physics, sci.geo.meteorology
Date: 2002-05-08 08:54:15 PST

Perhaps the authors could also search for images that might show currently forming ponding on Mars as well. One suggested area for currently forming ponding was also in Nirgal:

From: Robert Clark (rgclark@MailAndNews.com)
Subject: RE: Canvassing for pond-like features on Mars
View: Complete Thread (6 articles)
Newsgroups: alt.sci.planetary, sci.astro, sci.astro.seti, sci.geo.geology
Date: 2001-04-12 14:46:09 PST

From: Robert Clark (rgregoryclark@yahoo.com)
Subject: Re: Could Mars Odyssey map seasonal gullies on Mars?
View: Complete Thread (4 articles)
Newsgroups: sci.astro, alt.sci.planetary, sci.physics, sci.geo.geology
Date: 2002-03-29 00:33:50 PST

Bob Clark