$50 000 000 anyone?

... that's Zimbabwean dollars. Today I went to a talk at the School of International and Public Affairs (SIPA) by two Zimbabwean activists from within the MDC. The situation there is so bad at the moment. At some stage during the evening, they passed around a $50 000 000 dollar bill which had just been issued. It was worth US$1 as they passed it around. What is it worth now?