Hi,
Electric Pocket's Ringo lets you convert any Palm OS alarm tone into a ringtone for the Treo. You can also compose new tones and share them with other Treo users by IR beaming.
Ringo is free when registered via its unique SMS-based registration scheme.
More info on Ringo and other Electric Pocket products designed for Treo are at
http://electricpocket.com/treo
Cheers,
Iain
Electric Pocket