Zombies

Stanford University considers the matter:

"7. Conclusion

There is not always a meeting of minds in this debate. Some physicalists believe the zombie idea and its relatives exert an irrational grip on anti-physicalist thinking, so that

… it is tempting to regard anti-physicalist arguments as rationalizations of an intuition whose independent force masks their tendentiousness (Loar 1997, 598).

Correspondingly, some anti-physicalists believe their opponents’ commitment results in turning a blind eye to the difficulties:

Some may be led to deny the possibility [of zombies] in order to make some theory come out right, but the justification of such theories should ride on the question of possibility, rather than the other way round (Chalmers 1996, 96).

Regardless of whether those pessimistic readings of the debate are correct, and of whether the zombie idea itself is sound or incoherent, it continues to stimulate fruitful work on consciousness, physicalism, phenomenal concepts, and the relations between imaginability, conceivability, and possibility."

I'll just boil that down for everyone:

It means they are real!

So there.

More here and here. Oh, and here. Oh, and here.