I would like to announce that Retune now works an improved version of forked-daap. I’ve worked with the developer, ejurgensen, to add supported.
ejurgensen’s version of forked-daap is specifically geared to Raspberry Pi’s; however, you can build it for any Linux distro. I’ve been using it with Ubuntu myself. ejurgensen has greatly improved upon the initial forked-daap implemented and has updated it to match iTunes 10.
You can find more information about it on his Raspberry Pi forum post here: http://www.raspberrypi.org/phpBB3/viewtopic.php?f=66&t=49928
And at the GitHub repo here: https://github.com/ejurgensen/forked-daapd
Give forked-daap a try, it works great.