[brettfarrow]

That's definitely a real concern for some countries, but Zimbabwe has only used other currencies for years. When I went 5 years ago, you could pay for your entrance visa in either USD, GBP, or EUR. All large grocery stores had that day's exchange rates posted near the entrance in USD, ZAR, and at least one other currency (GBP, EUR, or Botswana pula are the ones I remember).

[sangnoir]

Things have changed in the 5 years - Zimbabwe now has a (quasi)currency - the "Bond notes" which are officially 1:1 with the USD. Getting access to cash in this quasi-currency is hard, getting it in USD is well-neigh impossible^w^w expensive.