I like to have a personalized ringtone for the people who call me most often. So I usually make my own by clipping the part of the song that represents the person to me. Though I'd share in case anyone else is the same.
Zip file includes:
Imogen Heap - Goodnight and Go
Weezer - Dreamin
Weezer - The Greatest Man that Ever Lived
Eminem - Just Lose It
Billy Joel - Movin' Out (Anthony's Song)
Billy Joel - My Life
Vampire Weekend - Run