Just thought of a cool way to make money transfering real cash for people using bitcoin.
Person A in some city/country, wants to wire money ($500) to Person D in some city/country
Person B and Person C both use bitcoin.
Person A gives person B $500 cash plus a handling fee
Person B gives person C $500 worth of bitcoin plus a smaller handling fee
Person C gives person D $500 (in local currency)
Inspired by Hawala:
http://en.wikipedia.org/wiki/Hawala