In response to the prior two posts: both seem like rather extreme reactions to program behaviors which are slightly different from the norm but for which there are good reasons.

1. This program is no more dangerous than other programs in terms of where it allows you to save your files. This is a permissions issue which has to do with the permissions of the user account operating the program, not with any special capabilities of the program itself.
2. It is certainly possible to save your files on a network drive. At the top level on your boot drive there is a folder called 'Volumes'. Open this folder and you will find all your mounted drives, including network volumes. Again, this is not any special feature of the program, but part of Mac OS X.
3. It is true that you can't open a to do list by double-clicking on it or dropping the file on the app -- but why would you want to? I don't foresee people creating thousands of to do lists and passing them around to one another. The typical user creates one or two or three to do lists for various purposes and then wants to open them on a regular basis. The program makes this easy by automatically opening your primary to do list for you whenever you launch the program. It also has an "Open Known" menu item that remembers all the to do lists you have previously opened and allows you to select any of them. So if you simply open the program first (preferably by having it automatically launch at startup) then opening your files is a snap.
4. It is true that if you move a to do file the program won't automatically find it for you -- you have to tell it the file's new location, simply be opening the file in its new location. Again, though, I am not sure why you would want to be moving your to do files around all the time. And I am not sure how the program would find them all if you did move them, especially if you renamed them as well.
5. The date selection is actually pretty easy. It defaults to a date far in the future so that, if you don't set a date, priority will automatically override the date in terms of sorting your undated to do items. However there is a "Today" button that allows you to set the date to today with one click. There are other buttons that allow you to advance the date by a week, day, or month, so that you can usually set the date you want with a few clicks, if you don't want to have to type it in. Again, this doesn't seem difficult to me -- although perhaps a little different from what people are used to in other apps.