BitPay as a payment processor in particular: https://bitpay.com/
All that is secondary though to the extreme lack of stability of value, which is pretty important in a medium of exchange. You might as well be telling him to accept tulips.
I'd be interested to see someone do a USD -> BTC -> INR -> BTC -> USD and see a) if it's even possible in a reasonable amount of time and b) at what cost.
Edit: here's a link to an Indian "local integration partner" of bitpay http://indiabitcoin.com/. They are buying bitcoins for 82% of what they are selling them for.
Oh, that isn't the case? Well expect to pay a transaction fee on buying bitcoins (about 5.65% where I live last time I checked).
Once everyone uses bitcoins, it will be a different story. Until then, it's pretty much like anything else.
Correct me if I am wrong.
