For those who do not know, Pluto is not a planet, but it has satellites, which means that it is the first multiple system of small bodies that we have known. With the discovery of Nix and Hydra, it had become the first quadruple system (of small bodies) we knew, and now, with the discovery of P4 in 2011 and P5 last July, it is now the only sextuple system that we know, at least for the time being.
P4 and P5 still have provisory names and the team wants to give them names, and it seems they could not reach an agreement over which names should be chosen, so they have narrowed the selection and are asking YOU to choose it :

[link]

So, go, and vote for your favorite names (please, consider Cerberus, pleeeaaaase), or give new ones !