I would personally suggest trying to push for more "clean" and legal ideas (as in not gambling or other grey-market things).
Bitcoin needs more press and publicity for legit non-sketchy things. It doesnt really need any more of a reputation for being a drug and gambling currency if our end game is to get larger mainstream usage down the road.
Just my opinion though.....
That said... anything e-commerce related would be nice. Maybe if merchants would offer a discount on the BTC price that would help motivate people to go to the trouble of finding out what it is. A good example of this is Slysoft and their AnyDvd product. 10% off if bought with BTC.
I am not sure about how friendly the experience is for merchants that accept bitpay or any similar service, but getting to avoid the paypal/credit card fees, risk of chargebacks etc help to reduce the cost of conducting business.
Because honestly, at the end of the day BTC is just another currency no different than USD, EUR or AUR as it can easily be converted into good ol greenbacks if that is what a business must pay their bills in.