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The HATNet project at CfA is performing wide-angle, high-precision
photometric monitoring of the sky with two goals in mind: to search
for extrasolar planetary transits and to characterize general stellar
variability. I will briefly touch upon the history of the project, and
tell how we started with a single telescope, and built up the two-site
Arizona--Hawaii network of seven instruments. Next, I will summarize
the operations and our experience of the past three years, and talk
about the current status of the instruments. I will describe our
methodology of search for planetary transits, from observations
through light-curve analysis to spectroscopy. I will list a few
auxiliary science projects that are related to HAT.
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