At the last Hack-A-N9 meetup, I've been working on a test app to show the currently-playing song. This has then been extended to a fully-fledged app that is easily configurable for the user, so that non-developers could use it (after all, hacks and scripts existed before that did the same thing).
The app is called "Billboard", and its goal is to provide useful information on the low-power-mode screen of the N9 in a way that "normal" users can use it. It also tries to be very lightweight on resources, and smart about updates so that updates are only made when needed, which saves battery power.
Billboard website: http://thp.io/2012/billboard/
Nokia Store link: http://store.ovi.com/content/279408
The currently-released version on Nokia Store is version 1.0.0, and an update (version 1.0.1) with some fixes to allow co-operation with MeeCast, fLPMC and other applications has been uploaded today and is currently waiting in the Ovi QA queue.
There's also a support thread on TMO in case you need help or have suggestions.