Subsonic V6 (Beta1) emerged last week with some significant upgrades and developments (in particular a new HTML5 web player, so no more Flash).
Gonna wait until it stabilises a bit more before we get it put it in to DietPi but it's easy enough to test out (and available for multiple platforms anyway so Mac and Windows folk can try it too).
Full list of features and d/l available here: http://www.subsonic.org/pages/features.jsp