I'm using miniDLNA to connect my Ubuntu PC with my Asus Transformer. Result is I get to play movies and music from my PC directly on my tablet!!
Here's how to setup miniDLNA on Ubuntu:
1) Get source file from here.
2) Extract and unpack the archive to a designated folder called "minidlna"
3) Edit file "minidlna.cnf" (config file in folder minidlna > etc )
4) From Terminal, go to the "minidlna" folder
5) Type the following command:
username@machine:~/minidlna$ usr/sbin/minidlna -f etc/minidlna.conf
*This needs to be typed in everytime you start the PC