Sony has its P800 wap site up with picsand sounds.
http://wap.sonyericsson.com/P800
If you checkout the ringtones you will see some of them are .rmf if you want to check them out on your PC you will need a player available form
http://player.beatnik.com/
If you have not heard of Beatnik you are in for a treat its a great format that lets you have tiny files with great sound. The sound is better than the Midi files but smaller than wav.
There are a lot of sites with rmf files some copywrited but it alows easy creation and a great indviduality for the P800 ringtones.
Here is one link you can play with : - http://www.hyperphonic.com/papabear/flashnik-remixer/remixer/