I have been looking for this app for two or three years, where have you been hiding it?

The current version does not work with Airfoil Speakers for linux -- complains of a version mismatch. Major problem for me as only one of my stereos is connected to an Airport Express, everything else us hung off linux boxes.

One other very annoying (occasionally painful) thing is that Airfoil does not remember the volumes settings. The Airport Express is connected straight into an amp with NO volume control. It's awfully loud when it connects at full volume - can't set auto-connect because of this.