VERY big news: astronomers have found two Earth-sized planets orbiting the same star! One is slightly smaller and the other slightly bigger than Earth, but they both qualify as the smallest exoplanets confirmed to orbit another star. Awesome.
Mind you, both are extremely hot - they orbit their star much closer than Mercury orbits the Sun. But the fact that we can find them at all confirms that the Kepler observatory can detect Earth-sized (and even smaller) planets. The ultimate goal is to find an Earth-size planet orbiting a Sun-like star at the right distance for Earth-like conditions, and this means we're another step closer to that goal.