MITRA I was really enjoying this app - until ... my mac crashed, (probably through no fault of Time Tracker). Everything else came back just fine after a reboot, but Time Tracker lost a day's worth of logs. I think it lost everything back to the time I started the Time Tracker application.
So beware if you use it, you might want to quit and restart it frequently.
The other big issue is that there is no way to export data, so there is a reasonable risk of losing everything.
(Version 1.0)