I have recently installed Ubuntu 9.04 on my Macbook (1,1) and was interested to see if I could easily stream media to my new install from my DLNA media server that I use for my PS3 (a Western Digital MyBookWorld NAS). The good news is that this is very simple to do with a plug in for the already installed Totem media player.
The coherence plugin provides DLNA functionality. This can be installed by simply typing 'sudo apt-get install python-coherence' in a terminal window. However, here I experienced a small problem. Opening Totem and going to the plugin menu (under the edit menu) you can see the plugin. However, when trying to activate it you get a popup error message. Luckily this too has a simple solution. Again in the terminal, as root create this file '/usr/share/dbus-1/services/org.Coherence.service' with this contents:
[D-BUS Service]
Name=org.Coherence
Exec=/usr/bin/coherence -o use_dbus:yes -o controlpoint:yes
Close and reopen Totem and the plugin can now be activated. Your DLNA server should now appear under you Totem menu playlist options, enjoy!
It is worth noteing that it does take some time to buffer the video before playback begins.
Links:
Coherence - Here
Guide - Here
Bug report with solution - Here