I have found a very useful Time Management software. i think it will help you. its called time left. i usually use it to track how long have i been online when all really needed to do was check out if i got back that very important reply. Instead of just spending say 10 minutes i
often find myself spending at least 45 minutes in front of the comp every time i log in for a small job.
You can use this for many many reasons. 
1.Its Completely FREE.
2.Users can select between setting a clock, a stopwatch, a reminder, an auction watch, a timer or a sticky note.
For a list other Alarm and Time Management Software check this link out:
http://download.cnet.com/Windows/Alarms-Clock-Software/3150-2350_4-0.html?tag=mncol
Download Links for TimeLeft:
1. http://download.cnet.com/TimeLeft/3000-2350_4-10034817.html
2. http://www.timeleft.info/
Other Opinions:
1. http://www.ghacks.net/2009/05/16/time-management-software-timeleft/
