I just stumbled upon this software for the Gnome Desktop called Getting Things Gnome !. It's a task organizer. I installed it on my Linux Mint 6 Universal.
You can get it at: http://gtg.fritalk.com/
I used this initially just a while ago and this stuff is good. I got my Linux mintMenu to start up this baby when I login so I can look through my task/to do list. This baby organizes things well too and you can add sub task here and there and it allows you some choices how you dispay the tasks and sub-tasks.
I would be testing and using this and see how it works.
That's all for now.