CPU mining can only really be done productively on CPU only coins or Folding coins like CURE. Even then it's a relative thing, GPUs dwarf CPUs currently.
Anyhow, IIRC, VNL suprnova hashrate was about half the entire network hashrate usually, sometimes a bit less (~300 ghash?)... Who/what was the other pool? It was thought to be just one man's farm, right?
Anyway, what's the latest on the whirlpool algo? Where's Wolf0?
I can not really say anything on the private hash, no one knows.
No public miners were released since the ones that are already in the op.
Wolf0 isn't usually releasing his mining software, he released one slower public miner earlier for VNL, but it's not the fastest anymore currently which you can download. You need to ask him on what he is up to currently ^^
John is currently only developing mining software for FPGAs.