What aspects of Money Order laws will apply to merchants who use Bitcoin? There are several money order laws that apply to merchants who accept them.   Bitcoin seems to have properties of a money order, but also some aspects of value that are driven by demand.

I'm looking for a clear and reasonable explanation of:


How do Bitcoins compare to (and differ from) Money Orders?
What aspects of laws that apply to Money Orders are likely to also apply to Bitcoin?


I'm most interested in US,  UK, and Australia, but any links would be beneficial.
In the U.S., FinCEN just determined that decentralized virtual currencies are not like money orders.

Money orders are the mechanism enabling the moving of currency or value that serves as currency from one person or location to another person or different location.

Using bitcoins for making a purchase from a merchant is not the same as moving currency.

Now if instead of providing goods or services the merchant instead delivers currency elsewhere, then that would be transmitting money and in the U.S. State laws specify the restrictions on money transmitters.  FinCEN requires that a money transmitter register a Money Service Business (MSB) and keep records according to guidelines.