Do you trade on Paypal at all? If so, you may find taking into account the transaction fees Paypal charge into your product price difficult. Not to fear though – I’ve come across a Paypal Fee Calculator site which will do it all for you. It’ll calculate the different fees in affect in the different countries Paypal operates – and even which level of “Merchant” you are in Paypal: and it’ll tell you how much you need to charge (or will receive) to take into account the fees.
It doesn’t do currency conversions yet, but it’s a good system to use (if you don’t mind all the complaints about Paypal.