Berqun is one of the best employee-monitoring tools I've ever seen.
With Berqun I can now measure my employees' productivity and base their salaries on it. By capturing visited websites and time spent in every application on the computer, it makes it easy to see whether working hours are productive. It gives a score — BQ — on a daily, weekly, monthly and yearly basis, which is all I need. On top of that, it captures start time, end time, total work time, network usage and screenshots. The agent is tiny (under 1 MB), easy to install, and configurable from the web app.