Transit Search is a program to coordinate and direct a cooperative
observational effort which will allow amateur astronomers to discover
extrasolar planets.  From their webpage:

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The discovery since 1995 of more than 70 planets around nearby
solar-like stars and the discovery of a transiting planet orbiting the
star HD 209458 has heralded a new era in astronomy. Furthermore, the
past several years have seen the introduction of highly affordable
small telescopes equipped with sensitive and stable CCD (charge
coupled device) detectors, and controlled by laptop computers. 
Thousands of amateur astronomers already own personal observatories
which, when properly configured, are capable of reliably detecting the
periodic dimming which occurs when a close-in giant planet passes in
front of the parent star as seen from Earth. We are proposing to
coordinate and direct a cooperative observational effort which will
allow amateur astronomers to discover extrasolar planets. A network of
enthusiastic amateurs can produce vital scientific information
regarding the frequency and nature of planets outside the solar
system. At the same time, this collaborative research project offers
an unprecedented opportunity for education and public outreach. The
project will be promoted through articles in amateur astronomy
periodicals, via the heavily visited SETI institute web site, and via
newsletters of professional education associations and amateur
astronomers. The discoveries made by the transitsearch.org network
will be confirmed by professional observers (specifically, The Lick
Observatory Planet Search Program), and the publication of the
discoveries will credit the participating members of the detection
network as the discoverer.
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Updated:	2001.12.21