You want to Instant Check Currency Conversion Rate Online ? Then Google Search will help you. To check currency conversion rate instantly enter currency code or symbol like – USD to INR
See the list of ISO Codes http://en.wikipedia.org/wiki/ISO_4217
Use bing search for currency conversion as shown below
Yahoo finance currency converter
Open http://in.finance.yahoo.com/currencies/investing.html and check multiple currency.
Google search is my best loved for checking current rates.