  The rise in the use of the arXiv preprint server (astro-ph) over the past
decade has led to a major shift in the way astronomical research is
disseminated. Schwarz & Kennicutt (2004) recently found that Astrophysical
Journal papers posted to astro-ph are cited roughly twice as often as papers
that are not posted, suggesting that the preprint server has become the primary
resource for many astronomers to keep up with the literature. I describe a
simple method to determine the adoption rate and citation impact of astro-ph
over time for any journal using NASA's Astrophysics Data System (ADS). I use
the ADS to document the rise in the adoption of astro-ph for three major
astronomy journals, and to conduct a broad survey of the citation impact of
astro-ph in 13 different journals. I find that the factor of two boost in
citations for astro-ph papers is a common feature across most of the major
astronomy journals.
