A recent enhancement in KMess is support for "now listening" information. You get to see what your contacts are playing. this information is displayed after the personal status message, and looks like this:

Much like the official client, you get small icon, and the title afterwards.
The next step is offcourse, displaying what you're playing. Work has started, and I've decided to use Kopete's "now listening" plugin as inspiration. It has support for Amarok, Kaffeine, Juk, KsCD, Noatun and XMMS. Sounds good enough to me 