Stats
Add some fun stats such as number of minutes listening to music, number of songs loved and banned and shelved, etc.
I'd be curious if a progress bar could be added by tailing stdout.
I've experimented with tailing it, and it doesn't seem to work correctly. It can't read the time unless there's a -f flag given.
pianobar tells you how long a song is at the firing of an event. You could probably use that to make a "dumb" progress bar. The hard part will be handling pausing.
check out the eventcommand.sh file from http://raspberrypiserver.no-ip.org/pianobar_pandora_remote_control.html
He's using bash, and reading the code is a huge pain, but it looks like he reads the time-left and duration and writes it to a file. he seems to just stack the numbers as they arrive, but there's no reason the file couldn't be overwritten on change.
He also pulls the upcoming tracks to a file... not quite sure how yet, but it seems to work well to give him a "what's next" view.
Just figured I'd let you know, I managed to get progress, by piping pianobar's output to a file, and manipulating from there. but it only really works if pianobar and the webserver are running as the same user (http, in my case)