Well, there's hopefully no harm in trying, although I'm not providing any guarantees. Given that, you can find what should be the needed collection of files at:

http://www.vsta.org/andy/pickup/n810_pianobar.tar.gz

This tar archive expects to be extracted in /, and puts things in /usr/local/lib, /usr/local/bin, and /home/user. The file for /home/user is the .libao config file to tell libao to use ESD for sound. "pianobar" and "llib" are in /usr/local/bin, and you're expected to start pianobar as "llib pianobar", which will include /usr/local/lib in the library search path.

I hope it works for you! I am certainly enjoying having my Pandora One subscription available on my n810.

Andy