Indian Rupee Symbol was officially announced by the government in 2010. It looks cool, but it’s not supported by default in web browsers. Fortunately,
webrupee api (not working anymore, check the update at the bottom of this post) can help you to display new Indian Currency symbol in your websites. The below video tutorial will guide you through the process.
Update April 2015: The webrupee api does not seems to work anymore. Instead, you may want to follow the tutorial on How to display or Fix Indian currency symbol issue on WordPress/WooCommerce websites.
Hope it helps someone out there.