XNote Stopwatch - Try the most feature-rich stopwatch and timer software on the net for free!
SnapTimer - SnapTimer is a simple, free, portable countdown timer for Windows.
Gestimer - For those little reminders during the day
LClock - Longhorn systray clock program
Stopwatch (Tk) - Stopwatch is a stopwatch and timer program that uses the Tk toolkit. Ugly but works.
Stopwatch - A Java countdown timer and stopwatch. Features a fullscreen and a resizable window mode.