The Rosetta probe has successfully landed on Comet 67P/Churyumov–Gerasimenko. It didn't secure itself properly, however, and wound up bouncing, placing it in a possibly unstable location with less than ideal sunlight.
Here're some of the pictures from the probe.
XKCD had a cute little play-by-play comic about it. You can see all of the panels here
It's a mindblowing achievement, given the distances involved. It will be interesting to see what they make of the situation.