BugMe - Pop-up yellow sticky notes for the PalmPilot. Shareware. - http://www.electricpocket.com/bugme-palm/old-bugme.html
BigClock - Current date and time displayed in huge letters. Supports four world time zones, four alarms, four timers/stopwatches. Silent, backlight, and custom tone alarms. Freeware. - http://www.bigclock.de/
WorldMate from MobiMate - A collection of Palm travel software for world travelers. Features world clocks, auto-DST, and currency and clothing size converters. - http://www.mobimate.com/worldmate
Cesium - Highly rated clock, stopwatch, and alarm software for the PalmPilot. [Shareware] - http://www.seanet.com/~aball/
Game Timer - An application for the PalmPilot which takes the place of a mechanical game timer (such as a chess timer). Freeware (source available). - http://www.eshayne.com/GameTimer/index.shtml
EarthTime - Graphically shows world time zones and their corresponding times. Shareware. - http://www.evolutionary.net/earthtm-info.htm