Time Tracking

Now that I have my scheduling scheme all worked out, I think I need a way to track how much time I spend on different tasks. For instance, I'm a quarter time research assistant so I need to be spending about 10 hours a week on my research. Also, it would be nice to know how long a certain programming project took to complete so I can budget a similar amount of time for comparable projects in the future. How can I keep track of my time? My first thought is to carry a little notebook around with me and record the times that I "clock in" and "clock out" for certain tasks. There's also a variety of software solutions out there, but that requires me to be near a computer all the time. Maybe I'll use a notebook during the day and record the times into a spreadsheet at the end of each day or week. This plugin for iGoogle and Netvibes looks promising, as well.