Best free PIM
Free service lets know how you are using your time
RescueTime is an online application which gives you a breakdown of how you spend time on your computer. The broad stats for me were email: 51%; surfing: 23%; reviewing: 11%; writing: 9%. However, much finer breakdowns are possible by tagging your activities, and this could prove useful to those who bill out their time to clients. To use RescueTime you need to install a small utility on your PC that collects the usage stats for the RescueTime server.
http://www.rescuetime.com/