The one problem is - bitcoin is decentralized monetary system and it is not owned by anyone in particular.
If bitcoin was a company like PayPal we would see Bitcoin commercials and ads everywhere on internet, press, TV.
But who will pay for Bitcoin ads? Bitcoin Foundation? You or me? I don't think so.
Well, maybe the Bitcoin-related companies would do it. Such as BitPay, they can afford the advertisement for promoting themselves. If we can just ask those companies to place and ad about Bitcoin, then it would be possible. The ad can contain some parts to promote the companies themselves, but the main idea of the ad is still for Introducing Bitcoin.
Exactly, because even if they promote themselves and users start using their service then soon they will also learn about bitcoins too. I think a ad like for piiko where they show users how easy is it to recharge mobiles with bitcoins could do awesome.