Go to various sites, check the AAA/BBB exchnage rate on each one of them. Print out the current exchange rate and also send an e-mail to yourself with the information. Also put a ARBITRAGE warning if there is a difference between the rates.

AAA and BBB can be any two currencies you are interested in.

Try the following sites:
  http://www.xe.com/
  http://www.oanda.com/
  http://www.bankofcanada.ca/en/rates/exchform.html