I too used the shoutcast client on zaurus, was quite useable, was translated to English by someone (forget the name, hermasoft?), but it was a bit ugly.

You could also use an old zaurus as a TCP to serial console driver.

Set up a streaming audio server and use it as part of an alarm system?

Install an x11 distro or one with vnc server, plug zaurus into your hifi, remotely run xmms and then can use it as an internet radio?