MediaStream for iPhone and iPod Touch
allows you to browse your entire media collection from your iPhone or iPod Touch.
The technology behind it is PHP
for the backend, Smarty
for the frontend.
Also, check out my MythTV for iPhone
and Asterisk Voicemail for iPhone
I just came across a similar software for Mac OS X. It's called Telekinesis. It does way more than this software does and is a native OS X application. If you have a Mac, you may want to check it out. Click Here