Twonky allows my OS X Mac to stream a variety of media types to both my Playstation3 and my Denon AVR-3808ci. I can specify any media directory, including my iTunes library. A web client allows for streaming to other computers and now, web enabled portable devices. Download the fully functional 30 day trial and see for yourself. Well worth the price.
Installation and configuration is relatively easy. Knowing that that default port is 9000 can help with that.
The previous version, 4.4.2 installed in /Library/StartupItems/MediaServer and /usr/local/mediaserver. Version 4.4.4 changes this and installs in /Applications (show package contents on the app to see the guts and .ini file). However, the current package installer warns of a newer version on my system and then fails the installation. Dragging the installer to unpkg (also available on MacUpdate), easily extracts the application for a manual install. Make sure you terminate any previous version and remove it before running the new app. Save your old ini file so you can copy settings and your registration number.