Open .rm files in Real Player, not totem in Firefox 3 beta 5

Install Real Player from here
Inside Firefox, Tools, Add-ons, Get Add-ons, mediaplayerconnectivity (or click here
for .rm/Real Media files, you'll want to point to the path to realplayer that you installed.

Depending on your settings, you might have to click *again* the link in the black sidebar.

No sound in Realplayer 10

http://ubuntuforums.org/showthread.php?t=168080
ShortShort:
sudo apt-get install alsa-oss
edit realplay file (around line 71)
change

$REALPLAYBIN "$@"

to

aoss $REALPLAYBIN "$@"