Hi,
I'm the person who ported xmms to the n8x0. I left the forum due to several reasons.. but i am tempted to buy an n900 so..
You can find it from gronmayer.com/it.
Does this not install? Yes, it's "chinook" but maybe nothing in xmms and dep conflicts with n900 os? Dunno really. At least for diablo, nothing needed to be changed

And yes, xmms, gtk is not updated anymore. They might contain security problems (one could create a user xmms to lower the risk of impact on "user" files).
Big problem: it's not hildonized, is probably impossible to be (I'm not expert on this). The code is huge, not particularly easy to read. Also there is a localisation problem in gtk so it's locked in LANG=C. Same problem appears on debian x86.
Big advantage: it's really fast and simple.
I'm nevertheless missing upnp features so I'm not using it anymore.

I've also put the complete directory as a tar.gz in the repository. gtk 1.x. I might still have it on my old laptop where I've developped this. And you can probably find it on archive of debian repo.

Report what are the problems.
Use at your own risk..

Everything is still archived by debian:
Debian packages daily archived since 2005/03/13:
http://snapshot.debian.net/