Xoom.com has best current conversion rates and fast service to transfer money to India.

(Source: http://jayesh.profitfromprices.com/India_Money_transfer_services.htm)

Xoom.com: Like PayPal, you can fund your transfer with any Credit or Debit card, or from a bank account transfer. For Credit card funded payments, they will charge a higher fee but it is still very low compared to PayPal.com. Plus, your credit card issuer may charge such transaction as money advance and you may end up paying some fees to it. So use a debit card or a bank account to lower your transaction fees. However, at the time of transfer, enter the coupon code COMEBACK2014 and your transfer will be free.

The benefits: Your counterpart in India will get money within hours!! Plus their USD-INR rates are very good. Nice website. I loved their service when I tried it yesterday. You can access them and look at current promotions by clicking here.

Also, for a limited time, Xoom.com offers $50 Amazon gift card when you transfer $150 or more.