Such "open book" accounting would also be very useful for NGOs (and has never existed before in any way that could be trusted).
Yes, for as much as the pseudo anonymity of bitcoin is touted, I believe some of it's real value is actually in the accountability it provides since everyone has a record of all transactions since the beginning of bitcoin. For any organizations that publicly disclose their bitcoin addresses, all money to and from can be openly tracked and verified. I think there is a lot of potential for disruption there.