Gah!
Just got back from a hot, sticky run in the hot, sticky heat, and in my delirium and shaky state, I managed to break the end of a plug off in the Treo’s headset jack. Great. I managed to get the end of the plug out of the Treo, but the headphone is shot now, unless anyone can reassure me that I can replace a plug on the end of a headset cord and have it sound OK.