If you don't have a lot of .rams you can download it and use it with mplayer.

I tested with one, namely http://www.bbc.co.uk/6music/ram/dsatg2.ram
It seems to include only this:
markus@fujibox:~$ cat dsatg2.ram
rtsp://rmlivev8.bbc.net.uk/farm/*/ev7/live24/6music/live/6music_dsat_g2.ra
Hence also the reference to a text file.

And so this works: $ gmplayer rtsp://rmlivev8.bbc.net.uk/farm/*/ev7/live24/6music/live/6music_dsat_g2.ra
And this: $ gmplayer `cat dsatg2.ram`

Now this interests me while I used linux a few years back and gave it up because of crappy multimedia support.
It seems to have changed nowadays, ergo I'm back in linux