The project is hosted on Github and details on using it are available at http://axemclion.github.com/rupee/.
To start using the symbol, simply include the CSS file available at http://axemclion.github.com/rupee/rupee.css. Then, add the HTML tag
<span style="font-family: rupee;">R&;lt;/span>at all the places where the symbol is to be inserted. The CSS file is around 8 KB and has the font embedded inside it. For IE, the fallback URL of the EOT file is specified to render it correctly. This CSS file was generated using Font Squirrel using the font here. Font Squirrel was used with Custom Subsetting and only "R" was included in the file to reduce the size of the CSS.
It becomes interesting to see how existing Indian sites look with the new symbol. You can find some screen shots here.
I also created a bookmarklet and a greasemonkey script that would replace all "INR" and "Rs." on existing web pages to give a feel of how the pages will look with the new symbol.
Tested on Firefox 3.6, IE 8 and Chrome5.