General ringtone: Public Enemy, "Fight the Power"
Friends: Chainsaw Kittens, "Calling from Space" or Chomsky (the band, not the writer), "00:15:00"
Best friend: R.E.M., "Can't Get There From Here"
Family: Love Button, "God is Dead"
Co-Workers: R.E.M., "Radio Free Europe"
My default is Haunted by Gary Numan, but I have about 12 others I use including:
Code Monkey - Jonathan Coulton
Crimewave - Crystal Castles
Down With the Sickness - Disturbed
Escargot - Industrial Platypus
**** it - Revolucian
The Fragile (Still) - Nine Inch Nails
Jizz in my Pants - The Lonely Island
Retrace a Walk - Zs
Something I Can Never Have (Still) - Nine Inch Nails
Superman's dead - Our Lady Peace
"Get the **** up, this [call] is real" - An edit I did for my own ringtone
and Unngh.
I use a few specific ones for my gf and a few close friends, but my default one for others is 'Magical Sound Shower' - for Sega's OutRun (0:44 to 1:34).
Note: Not the sound from this video, but a proper mp3.
Wife - Beatles "something"
Brother - Fish heads
Friends - Top Gear soundtrack
- Arrested Development soundtrack
Everyone else - Michael Schumacher techno song
I'm starting to use Garageband '09 to make my own custom ringtones.
It's unreal some of the loops they include in the program. You can combine so many sounds and instruments that regular mp3 tones are now starting to sound boring to me.