[Thanks to Darin for the heads-up]
To borrow a line from the movie Zoolander, extrasolar planets are sooooo hot right now. And right now the hot topic in the field of extrasolar planets is the results from the Kepler Space Telescope, which since March of 2009 has been staring at the same patch of sky continuously, looking for the tell-tale dimming of stars as extrasolar planets pass in front of them. Obviously ground-based telescopes can't do this and Kepler will be the first space-based telescope to do it for large numbers of stars, so it is likely that Kepler will find the first Earth-like extrasolar planets in human history.
The problem is that for an extrasolar observer with an alien version of the Kepler spacecraft to find the Earth, he/she/it would need at least 2 years of data before he/she/it could definitively say that he/she/it had detected our planet because what you really need to see are three dimming events with the time between the 1st and 2nd equal to the time between the 2nd and 3rd. That in and of itself is no big deal - good things come to those who wait. However people are impatient and scientists love it when the public actually cares enough to be impatient. So a week ago one of the very select few astronomers with actual data, Dimitar Sasselov, leaked the initial results in a TED talk. You can see the whole talk below (the kicker comes at roughly the 8:15 mark), but here's what he wasn't supposed to show us:The official count as of today is actually 471, most of which are the size of Saturn or bigger, so Sasselov just indirectly announced that (a) Kepler has found more planets in 18 months that the rest of the astronomical community had in 10 years and (b) most of Kepler's planets are Earth-sized.
Anyone who knows anything about NASA's views on preempting their press conferences knows that Sasselov is going to get a very stern talking to.
Here's the TED talk: