Screenshot of the timeleft program. A progress bar that shows the time left in your day, and text that numerically represents the time left in your day

It still shows how much time is left in your day (at work or awake) as a progress bar.
However, now it reminds you that the day is over with notify-osd popups, which look really nice in Ubuntu 9.04.

It also, optionally, has an audio reminders, which are numbered ogg files. I have included a personal set of ogg files, and think you may enjoy them. If they don’t fit for you, just replace the set with a different ogg files, or disable the sound notifications.

timeleft.zip

To install, simply extract the above archive in your /home/$USER/bin directory. You may need to get some dependencies, so run this just to make sure you have all of them.

sudo apt-get install python-gtk2 gtk2-engines python-pygame 

It should work, just like that. However, you will want to change the times and maybe a few other settings, so have a look at the top of the /home/$USER/bin/timeleft.py file.

Thats it. Just type timeleft.py to run the program. Write it in the terminal, set it up in your gnome-session, or make a desktop icon. Whatever works for you.