Most services charge a fee for historical volatility, which to me seems a bit goofy since it is a really straight forward operation. The following is the HV calculation in case you are interested:
1) Return, where Pt is close price on day t.
4) Annualized Historical Volatility is calculated as HV=HVdaily*sqrt(252)
Additionally, the five-month chart of VIX futures that I wrote about on Saturday does update dynamically so you can check that at any time on the same page. I think it's probably too valuable to just give away so this may change in the future.