http://www.astro.ucla.edu/~wright/cosmolog.htm#News
News of the Universe

Science Magazine names "Illuminating the Dark Universe" as Breakthrough of the Year

19 Dec 2003 - With the Wilkinson Microwave Anistropy Probe (WMAP)
results on the most distant parts of the observable Universe, the Sloan
Digital Sky Survey (SDSS) results on the large scale structure in the
galaxy distribution "near" (within several billion light years) the
Earth, and the confirmation of the correlation between the CMB
anisotropy and the large scale structure produced by the late
integrated Sachs-Wolfe effect by Boughn & Crittenden (2003); Nolta,
Wright et al. (2003); Fosalba & Gaztananga (2003) & Scranton et al.
(2003) the evidence for a Universe dominated by a "dark energy" is now
quite strong. This dark energy, or "smooth tension" in Sean Carroll's
words because it is unclustered and has negative pressure, was first
seen in accelerating expansion of the Universe found using supernovae.
The accelerating expansion of the Universe was the Science Magazine
Breakthrough of the Year for 1998.

See: http://www.astro.ucla.edu/~wright/cosmolog.htm#News which
includes the embeded links.

Ref: http://www.sciencemag.org/sciext/btoy2003/
Illuminating the Dark Universe, Science 2003 302: 2038-2039