If you issue invoices in different currencies I invite you to try out Invoiceplace.
You can sign-up for a free account (limit three customers) configured for the UK (i.e. VAT, currency in GBP) but you can change the currency for individual invoices and quotes/estimates (i.e. US, Australian dollars etc).
You can also use Invoiceplace without any sign-up required to create and print (PDF or Word format) your invoices.
