Some reports were also given at the 2003 Lunar and Planetary Science Conference in support of the early warm, wet Mars model:

CHARACTERISTICS OF MARTIAN VALLEY NETWORKS AND THE IMPLICATIONS FOR PAST
CLIMATES. Robert A. Craddock1, Rossman P. Irwin, III1, 2, and Alan D. Howard2, 1Center for Earth and Planetary Studies, National Air and Space Museum, Smithsonian Institution, Washington, DC 20560 craddock@nasm.si.edu, 2Department of Environmental Sciences, University of Virginia, Charlottesville, Virginia 22903
ah6p@virginia.edu.
Lunar and Planetary Science XXXIV (2003) 1888.pdf
"These observations suggest that valley
network formation was a long-lived process that competed
with other geologic processes, such as impact
cratering and volcanic resurfacing, that were also pronounced
in the early history of Mars. The drainage
densities we calculated are a factor of 20 times higher
than previous estimates (~0.193 km-1 versus 0.01 km-1
[3]), and are similar to densities for terrestrial runoff
channels. There is also good agreement between
drainage density and slope, arguing against suggestions
that valley networks occur as isolated features or in
clusters [4]. The simplest explanation for these observations
is that the early martian climate must have
supported precipitation and surface runoff."
http://www.lpi.usra.edu/meetings/lpsc2003/pdf/1888.pdf

NEW DATA REVEAL MATURE, INTEGRATED DRAINAGE SYSTEMS ON MARS INDICATIVE OF
PAST PRECIPITATION. B. M. Hynek and R. J. Phillips, Department of Earth and Planetary Sciences and McDonnell Center for the Space Sciences, Washington University (One Brookings Drive, St. Louis, MO 63130
hynek@levee.wustl.edu).
Lunar and Planetary Science XXXIV (2003) 1842.pdf
"We argue that the new data provide support for
some degree of surface runoff (and by inference precipitation)
on Mars in the ancient past. Surface runoff
the simplest explanation for the integrated drainage
basins, valley heads near the top of divides, and drainage
densities comparable to terrestrial values seen in
MGS data. Later modification by groundwater processes
and aeolian infill are likely. However, early precipitation
and surface runoff may be necessary to explain
some of the observed surface features of Mars,
and thus the climate must have been significantly different
in the past."
http://www.lpi.usra.edu/meetings/lpsc2003/pdf/1842.pdf

Bob Clark