I heard they have to wait about 15 minutes before they can open the solar panels. The rockets that were fired during the landing threw up a lot of dust which has to settle first.
What I find most impressive (other than the flight there and the landing!) is how the probe contains a whole lab. It'll process the samples and return the results to Earth, all without requiring a human scientist to do an experiment. Might just be more impressive than sending people to Mars!
Now if only they had attached a HD camera and streamed some high definition video for our viewing pleasure

The first pictures are supposed to come in about 20 minutes from now.