According to the BBC the Philae lander has just re-established contact [bbc.co.uk]:
Philae was dropped on to the surface of Comet 67P by its mothership, Rosetta, last November.
It worked for 60 hours before going to sleep when its solar-powered battery ran flat.
BBC Science Correspondent Jonathan Amos says the comet has since moved nearer to the sun and Philae has enough power to work again.