There's something very strange going on here. I've been going through retagging my collection with Jaikoz - sitting in a WMP library on a Windows 7 machine, streaming to a 360 as well.
After some research, it looks like ID3v2.3 with UTF-16 encoding is the way to go, since neither Windows nor WMP support v2.4 yet. Cool. Fair enough. But then I put some test files through, and the title of each track comes out with gibberish in an asian script - Thai I think.
It's appearing like this in Explorer and in the WMP library. The filename and other tags are fine, it's just the Title tag. And when I load it back into Jaikoz to check, it comes up absolutely fine, with the title as it should be.
Anyone got any ideas?