Currently, the Kepler spacecraft can't collect data, but it's already made observations on 150,000 stars with 21 million light curves. (The light curves show the light from a star – if there are planets moving in front of it, there will be occasional dips in the light.)
The data has come in faster than it can be analyzed, but there has been an update this month. There are now over 3500 exoplanet candidates, though not all of these will turn out to be planets. Interestingly, there was a big increase in the number of smaller candidates in the Earth-sized range. Here is a graph of
the current tally of planet candidate sizes.
