Does anyone use any software that they have purchases? I have heard of Fitday, are there any others?

I use Diet Organizer. At first I used the desktop version, but now I use the PDA version.

This is also calorieking. I have the desktop and pda version.

I am curently using the free 7 day trial version of Calorieking Nutrition & Exercise Manager and really like it so far. I plan to purchase the full version when my trial is up.