That link uses the "official" conversion rate of 30,000 US$ = 1 Zim$. Recently the Reserve Bank of Zimbabwe has let its currency trade "Freely" and it is currently around 255,000,000 US$ = 1 Zim$, so 1 oz Gold = 224,000,000,000 Zim$, so if you have a few billion Zim$, buy gold now as it will be far more expensive next week!
http://www.rbz.co.zw/currencyexc/Forex_16052008.asp
Seriously though, how could you halt hyperinflation once it gets hold? (As in Zimbabwe)