This directory contains an application for testing the behavior of various streaming-network-audio players. It creates a test MP3 stream that produces metadata in various ways, to let you see which variations work with which players.
Let me know if it leads you to any interesting or useful discoveries.
It's probably the case that this blog post is no longer completely true with iTunes 11.1.5, but I haven't tested it thoroughly. I started to do that, since I wanted to make sure that mixtape 14Ø was working properly, but then I realized, "Wait, what the fuck am I doing?" and just added support for audio mixtapes through a jPlayer popup instead, so that I don't have to care whether iTunes works. And that seems to be working, even on iOS. So there's that.