Currency Exchange = 為替
Getting used to currency from another country is never easy. There are so many sites out there that it is difficult to know which one to refer to. Some are updated more frequently than others. I have listed a few that I like to go to.
Yahoo Currency converter- This is a good simple converter that give you a quick ref guide that you can print out for your travels.
Oanda.com- Here you can convert to and from any currency as well pull up history to see trends of how a particular currency is moving. I also like the travel cheat sheet put out by Oanda.
Xe.com Xe provides a quick conversion format as well as a good cross rate sheet.