Since I am an expatriate I know the importance of exchange rates, well many of them would be like me. Xe is online currency site which gives live exchange rates and which is most accurate. I have been using it for past some time and would recommend to you all. With Xe you can convert any currency to any other and has almost all world currencies in their list and with most accurate and live rates.
Apart from this you have Xe Datafeed which is dedicated to business officials and corporates. You can also do a online currency trade well if you looking for some money business.
Well if you are frequent looker of a particular exchange rate you can sign up for email update where you will receive exchange rates of your choice right inside your inbox.
Check it out: Xe.com Homepage.