nServiceBus vs Mass Transit vs Rhino Service Bus vs other?

Question

Just doing some quick spikes into possibly using a messaging system to process files that are in a nicely decoupled work flow system.

What are the pro\'s and cons that p

Answer 1

An update to the state of Rhino vs NServicebus:

http://www.infoq.com/news/2012/04/nservicebus3-0

InfoQ to Ayende: You have previously written a service bus for .NET yourself, namely the Rhino Service Bus. Should users of Rhino Service Bus now reconsider and move to NServiceBus?

Ayende: I built Rhino Service Bus around 2008. I built it mostly because I wasn't happy with the state of the other service buses at the time. I have had different concerns and direction when building my service bus, but that was 4 years ago. In that time, I think that NServiceBus made great strides in becoming an easier to use product and having a much better out of the box development story. If I was starting out with service buses today, I strongly doubt that I would be building my own.