Kepler Mission

Kepler: NASA's first mission capable of finding Earth-size and smaller planets around other stars
The centuries-old quest for other worlds like our Earth has been rejuvenated by the intense excitement and popular interest surrounding the discovery of hundreds of planets orbiting other stars. There is now clear evidence for substantial numbers of three types of exoplanets; gas giants, hot-super-Earths in short period orbits, and ice giants. The challenge now is to find terrestrial planets (i.e., those one half to twice the size of the Earth), especially those in the habitable zone→ of their stars where liquid water might exist on the surface of the planet...
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http://en.wikipedia.org/wiki/Kepler_Mission

Well, I wonder when it will be checked put and calibrated. They must look at "old stars with planets" that were discovered with old methods. I can see a few of those turning out to be mere sunspots.