TimeTracker - a time tracking application that requires very little or no user intervention at all. TimeTracker is a PC activity monitor. TimeTracker will sit in your system tray and check every second which window is currently active on your desktop. The active window is the one you are currently typing or clicking in, and should be an accurate estimate of what you are working on.
TimeTracker captures the window caption from the title bar and tracks the active time for that window. TimeTracker also allows the traditional feature of manual timers, you may enter your own task name and either double click (or use Space or Enter) to start/stop the task timer.