Exciting times!
Diet Pi has been under heavy development and v100 is about to drop. This version completes the migration to 'Jessie' (the current version of Debian / Raspbian) and also sees DP establish itself as probably the most comprehensive platform for building audio devices on a Pi.
In v100 you are now able to install the following audio platforms / programs
MiniDLNA
http://sourceforge.net/p/minidlna/git/ci/master/tree/
MPD
http://git.musicpd.org/cgit/master/mpd.git/
YMPD
https://github.com/notandy/ympd
SubSonic
www.subsonic.org
SqueezeBox
https://github.com/Logitech/slimserver
Ampache
https://github.com/ampache/ampache
I'm really looking forward to testing out Ampache, when I first started using Subsonic it was the only real competitor on features but development on it had died off. Since then it's come back into active development and is a lot more free than Subsonic (no 'premium' licence aspect).
For the next cycle I'm going to be working on ensuring the installation of subsonic is as minimal as possible.
As well as a range of software options (and i2s DAC drivers) dietpi also includes a number of simple tools to tweak and maintain your pi with - including dietpi-sync which can back up your music folder (across the network if needed) and keep track of changes, dietpi-backup which enables you to back up your whole configured system and dietpi-nice which lets you change the processing priority of the apps you've got installed, channelling resources to the most important ones.
Try it for yourself with info and images available at http://dietpi.net