Have a look at the Mylyn plug-in for eclipse and TaskTop Pro. Even if you don't use eclipse as your IDE, there is a standalone version and it connects to your b

Have a look at the Mylyn plug-in for eclipse and TaskTop Pro. Even if you don't use eclipse as your IDE, there is a standalone version and it connects to your bug-tracker / gmail and other task repositories, and let's not only very easily track your active time on tasks/tickets, but has some very cool tools for staying focused and organized. And the reports really do help understand where your time goes. They also help you see how your productivity is declining through the week, and the patterns that match when you can really burn through stuff.