According to readme:
Daapsharing on Nokia 770
========================

For use daapsharing on Nokia 770, you need start the service mDNSReponder

use this in xterm:
$cd /var/lib/install/usr/bin/
$./mDNSResponder

now you can start Rhythmbox and enjoy.


Now, what is DAAP?

"The Digital Audio Access Protocol, or DAAP, is used by Apple's iTunes 4.0 digital audio player to share music across a network or the Internet."
- http://daap.sourceforge.net/

Ok, this definately sounds very intriguing indeed. Although, I must admit that using 770 as a remote with VNC to control itunes is nice as well. But this is indeed even better.