I started a general VIX discission here, and I will address your question:

VIX and Volatility General Discussion General discussion of anything and everything about volatility, real, implied or forward. VIX, SPIKES, TYViX, GVZ, OIV, etc. incl. RealVol Also risk management products such as VIX-related ETFs, VIX futures and options, and of course SPX and SPY …

Thanks. I am reading your reply there.