Nice roundup if the world's least spendable currencies — someone just told me that the exchange houses in London don't even have a "buy rate" for Zimbabwean money, because the inflation is so rapid that they don't want any more of it.
I bought some 100,000,000 Dinar notes in Serbia last week with Nicola Tesla on them — I think I paid about $1 for the note, and apparently, this is the highest value that note ever had.
Currency: Zimbabwean dollar (ZWD)
Inflation rate: 3,714 percent and rising
Exchange rate: Officially, 250 ZWD per US$1; unofficially, as high as 750 ZWD to the U.S. dollar