If you're not looking for a complicated project management tool, but just a simple way to track how much time you spend on projects or goal-related tasks, web service Colorhat offers simple task tracking and statistical feedback charts.
Marking your time spent on projects, or sub-projects, happens using the timeline and selecting the block of time you want to assign to the task or server, by hitting the play arrow next to the task or service you want to begin recording time for, or after the fact by entering a time range. You can use a variety of conventions like ":30" to indicate you worked on it for the last thirty minutes, "since 10" to indicate you've worked on it since 10AM, or "10:00 to 16:00" to specify a block of time.
The results of your time tracking can be viewed as weekly bar graphs, a custom timeline, or as a pie chart indicating how much time you devote to each product and task. You can play with a demo of the service before signing up for a free account, available here.
Have a favourite time tracking tool? Found a way to fit Colorhat into your productivity mix? Let's hear about it in the comments.