This week I made a simple script to track my time (ask by my management recently). It lets you create/close tasks (one task is a single line description).
There is only one task elected as "current" at a given time, which is a symlink to the actuall task. When you create a different time, the timestamp is recorded in the file, and a keyword "now" is added to define when you finished it.
When you close a task "now" is replaced by the timestamp, and "[CLOSED]" is prepended to the subject.
You can list you tasks, or export them in csv form if you want to post-process them.

I'm not quite sure if it will help, but it does a good job at tracking time :)

If anyone is interested, I can post the script tomorrow.