Good news for customers who have clients in different countries:  you can now change currency on each invoice.  Just create an invoice, and you’ll find a new dropdown box below tax where you can choose from a long list of currencies.  Harvest will tally up the invoices, so you know how much you’re making and collected in each currency.

Bonus: you can choose a preferred currency for each client (under Manage > Clients), so the next time you create an invoice for the client, the currency will be chosen for the invoice automatically.