We discussed here the report by Aharonson et.al. that argues the dark streaks seen on Mars are related to liquid water:

New report supports England/Palermo that the "dark streaks" are water related.
Posted by Robert Clark (68.81.141.219) on 5/24/2002 12:04:48 AM.
http://www.habitablezone.com/space/messages/21801.html

The full paper to appear in Geophysical Research Letters is available online:

Slope Streaks on Mars: Correlations with Surface Properties and the Potential Role of Water.
Norbert Schorghofer, Oded Aharonson, and Samar Khatiwala
Abstract. The Mars Orbiter Camera on board the Mars Global Surveyor spacecraft has returned images of numerous dark streaks that are the result of down-slope mass movement occurring under present-day martian climatic conditions. We systematically analyze over 23,000 high-resolution images and demonstrate that slope streaks form exclusively in regions of low thermal inertia (confirming earlier results), steep slopes, and, remarkably, only where peak temperatures exceed 275 K. The northernmost streaks, which form in the coldest environment, form preferentially on warmer south-facing slopes. Repeat images of sites with slope streaks show changes only if the time interval between the two images includes the warm season. Surprisingly (in light of the theoretically short residence time of H2O close to the surface), the data support the possibility that small amounts of water are transiently present in low-latitude near-surface regions of Mars and undergo phase transitions at times of high insolation, triggering the observed mass movements.
http://www.gps.caltech.edu/~norbert/Research/water.pdf [Full text]

The authors do cite England/Palermo in their paper.

Since one of the areas where the streaks are preferentialy located is Tharsis this provides further independent evidence for the conclusion that near surface water/ice currently exists in near equatorial regions on Mars.

Bob Clark