I am curious to see what people think will be the "break out" use for BTC that will lead to its mass adoption. Despite all the publicity BTC is still an abstract novelty to the general public much like amazon.com and eBay were in 1995.  So, what will be the first true use on a popular scale?

I, for one, think it will be for money transfer.  BTC is a big improvement over the current system of sending money, especially for migrant workers and the working class "unbanked."  Buying things and preserving wealth seems like a much tougher sell to the average Joe who is perfectly comfortable with good old fashioned dollars.