Clocks and Timers

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/

BugMe
Pop-up yellow sticky notes for the PalmPilot. Shareware.
http://www.electricpocket.com/bugme-palm/old-bugme.html

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

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