Since I received a comment that Shoutcast streaming wasn't working well with SGI's mpg123, I decided to release a tardist of mpg123-pre0.59s for those using my GQmpeg tardist. This build has been patched against the "Gobble Exploit" recently unveiled on bugtraq (MAX_INPUT_FRAMESIZE has been set to 4096 to prevent buffer overflow in common.c).
I've done some testing with Shoutcast streams on this build and everything is working beautifully; the test station used was Japan-A-Radio at http://lsac1-0-s04.shoutcast.net:8046/ as I love that sort of thing :)
Keep in mind that this tardist does not remove or overwrite the mpg123-0.59r package in /usr/freeware/bin. As my tardist installs in /usr/local/bin you may have to reorder your search path or simply remove the older build.
As always, let me know if you have any problems.