This sounds good.

In addition, there was a thread on the forum (I'll search for the link) where someone asked how people used to handle mail-orders before credit cards. The response was interesting, in that people used to use irreversible payment methods, but had means of proving payment to the entity. Bitcoin with emailed pre-payment receipts ("Payment of 1.2 BTC to 1Ajk... is proof that payment has been made to My Awesome Bitcoin Co.") can serve the same function, and provide much greater benefit for merchants.