In addition to the anonymous VPN, web hosting and filesharing providers mentioned before, it would be cool if some IT freelancer sites, many of which offer an escrow service, accepted BTC. Any other cool ideas?
I think it will be very perfect on groceries or in stores like Walmart. You just won't wait for some people to count their money and change in the line because they can just scan the amount that they need to pay in an instant by using bitcoin or other altcoins. I also like it to be accepted in jewelry stores especially on high end luxurious watches.