My apologies for going dark on Songbird PPC builds. I had to rehack the qtwrapper for gstreamer to make it work again and then I was having major failures with the move from the 1.9.0 to 1.9.2 xulrunner. But I've got a mostly working build up and running, which I'll release to the world shortly. I just have to zip up the extensions built for this version and load it up to the server.
I haven't gotten the Shoutcast Extension to actually play music, though it loads the station lists. I haven't had time to debug what's going on, but have noted that there have been issues with shoutcast from many of the open source audio players.
The upside of the nightly build is that the 1.9.2 builds just feel a lot faster to me. Of course I haven't tested these latest builds on other Macs, and I haven't been as careful about isolating my build tree, so there may be crashes on OS X 10.4.x or ones that don't have my pkgsrc builds. If it does crash for you, feel free to drop me an email with the crash report.