[From Eric Mann] TreoHour is an excellent program and one that I used on my Treo 650. "TreoHour is a small chime application that causes the Treo to emit audible beeps every quarter hour (single beep), half hour (single beep) or one hour (two beeps). TreoHour has several user configurable options. From v2.5 on, the "Full Screen" option also displays the ringer status and alerts, messages and email counts. Now, includes KeyGuard and PopUp functionality. Be aware of the passage of time with TreoHour. " It has been updated:
Implemented slider-only unlock option.
Chime beep duration of 1/8 secs added.
Fixed a few subtle bugs introduced in v4.7.