I recently dug out my old slug and flashed it with unslung. I did this with the sercomm utility. As i had Windows 7, i used a virtual server with xp before it worked, as well as hard coding the ip address. I put the install into a Flash drive for speed and ran into the not a hdd bug – fix was to use easus to do ext3 formatting on win7.
I then added twonky. I have tested audio playback on atv2 (Apple tv) with xbmc, ps3, android twonky client and it played mp3, wma, m4a and aac ok. Video ok-ish, but not wihout stutters.
To see the tunes in iTunes, i then added mt-daapd. This adds a shared library in iTunes but does not seem to then share across to atv2.