Hi,
I also think it would be good for J River to specifically expose API methods to allow direct querying of the media library. J River has good sound quality and is a flexible all-in-one package. However, there is no reason to keep a monitor, keyboard, mouse, or a remote control hooked up to the PC in my listening room when devices like the iTouch can be used as remote controls for a large variety of applications.
If you add library browsing into the API, J River would become a valid competitor to products like Squeezecenter / Squeezebox, and would include greater functionality and flexibility.
Thank you,
Alan