That's the one-sentence summary of the Kepler orbital telescope's preliminary results from a survey of some 156,000 stars. So far, Kepler's found 1,235 planet candidates, including 68 roughly Earth-sized and 19 supergiants. More interestingly, 54 planets were orbiting in the "habitable zone" around their parent stars (i.e. the region where temperatures allow liquid water) -- and of those, 5 were Earth-sized worlds.
Okay, cool. What does this mean?
Well, it means there are a lot of planets out there. Bear in mind that Kepler detects planets by measuring the slight dimming of a star's light caused by something passing across its disk. That means that the 1,200-odd worlds are just those with orbits that happen to take them between their parent stars and the Kepler telescope. Presumably the Kepler discoveries represent only a tiny fraction of the actual number of stars it observed that actually have planets. This, in turn, means there are literally millions of worlds in the Milky Way Galaxy which could be suitable for life to evolve on.
If there are lots of places life can evolve, but we don't see any evidence of intelligent life elsewhere, there must be a bottleneck somewhere. Maybe multicellular life is a lot more rare than we think. Maybe intelligence hasn't shown up very often (Earth got along without any intelligent species until we came along). We just don't know. But we're learning more about what we don't know.
Here's more on the Kepler results from Phil Plait.