Doing some googling, I bumped into with this website

http://www.plusconvert.com/

Although the web does not appear to be trustable, the idea is not bad.
I hope we could find soon that an entrepreneur has turned this idea into a profitable business.

many people already done that.. it's just difficult to get trusted site to do exchange

There was also mondopay.com but they don't get popular because they fall because of fraud. they get scammed pretty often and also they can be held liable for violating payment processing sites like paypal.com and moneybookers.com