I've commited an upgrade to the RabbitMQ libraries in Mono to version 1.6 bringing Mono in line with the latest from the RabbitMQ team.
I've been working on a couple of other pieces, mostly a reworking of the MessageQueue integration code in order to have Connection objects hang onto AMQP channels. Currently a new connection to the AMQP server is created for each request, which will obviously have an impact on latency. I'm holding off committing this work for now as I want to use .NET 2.0 features which will be easier post the 2.6 release.