download the full mobile video (high sound quality, 670 kbytes, qvga/aac, only for current mobiles, e.g. Sony/Ericsson K800i)
download the small mobile video (low sound quality, 526 kbytes, qcif/amr, compatible to most mobile phones, e.g. Nokia 6230i)
this sound is also available as a high-quality mp3 ringtone.
How to install the video ringtones on your mobile phone:
first check if you got a software CD delivered with your mobile, and install this.
otherwise, you may download a free software package from your mobile vendor first, often called "PC Suite".
if an usb cable is delivered with your phone, it should be simple: connect your mobile to the pc, then copy the .3gp files into some "video" or "movie" folder on your phone.
other ways of connecting your mobile are bluetooth or infrared. this may or may not require some additional hardware for your pc, e.g. bluetooth interface stick.
once the files are copied to your mobile, select them as a ringtone, if possible.
older mobile models may not be able to select a video as a ringtone; in this case, a non-video mp3 ringtone may work. but you can still play the videos directly, or maybe select them as a mobile screen saver.
if you copied a -vac.3gp file, and it cannot be played back at all, or has sound missing, retry with the -cmr.3gp files.