According to this BBC report, Zimbabwe is introducing a Z$100 trillion note, which is currently worth about US$30 or £20.
Just for the record, according to Steve H. Hanke at the Cato Institute Zimbabwe's inflation rate is 89,700,000,000,000,000,000,000% This is as at 14/11/08. There is an interesting note on the web page for Zimbabwe's inflation rate,
Since mid-November 2008, the weekly update of the HHIZ has been put on hold. The market-based price data from Zimbabwe have deteriorated and, at present, cannot be used to update the HHIZ. HHIZ updates will be resumed as soon as the quality of the data reaches a satisfactory level.So we can't even estimate the inflation rate in Zimbabwe. We just know its got to be a lot more than what ever that number above is!