None of the existing mining pools support NiceHash as their stratum minimum difficulties are too low (NiceHash needs minimum difficulty of 128 for Scrypt)
So I've added CCN to my pool and I have 2 miners pointed towards it and solving blocks

Feel free to join me at
http://morehash.pw - no registration necessary
is supporting nice hash speeds on port 3355.
See posts about this and confirmed working a few pages back..