Pay your mates back with Bitcoins
We have all gone out to lunch or dinner and split a bill. There is *always* someone in the group who wants to put the entire bill on their credit card and take cash.
In these situations, Bitcoin owners should offer (and insist) they pay their share with Bitcoins. This will spread Bitcoins to people who find it all too hard to buy off an exchange. Hopefully, they will continue the trend and spread the coins.