Now I might not be a card caring member of the Hi-Fi High Society, but I love my Audio based entertainment.
pianobar Integration would be awesome
http://6xq.net/projects/pianobar/
also Podcast catching! Using Podget (http://podget.sourceforge.net/)
Or Podracer (http://podracer.sourceforge.net)
The pages look dated as heck but the projects are alive. I know one of them is in the Debian repo but not sure which it is.
I know super well thought out 
BTW: Your work so far is amazing!