If you are connected to the net, then install orb (www.orb.com) and you will be able to stream all your media, pictures, music, video and live tv over the net to your N80.
I am not that comfortable with using Orb as it is pretty resource heavy, and also I don't like the idea of some website having a list of all my files on record so for these reasons I don't use it.
However I found a different piece of free software which sets up a streaming MP3 server on your machine without having to register at a website (http://www.vibestreamer.com/).
This is a pretty good piece of software which uses minimal memory and bandwidth. However I cannot get it to work in the N80s browser (or in Opera) if anyone else can manage it I reckon it could be a goer...