I agree with all the positive feedbacks, and wanted to add a few things. One important thing for those with a lot of menu apps is that you can assign a hot key keystroke to open/close Check Off. So if you have so many menu apps (like I do) that some get crowded out when using certain apps, you still have easy access to Check Off.

Also, I found this app to be incredible easy and intuitive to use. I had a fully functional ToDo list running within seconds of downloading the file. When you open the .dmg file, you are presented with the Check Off folder and an alias to your Applications folder. Installation is a matter of simply dragging the Check Off folder on top of the provided alias.

When you open the Check Off app, the checkmark appears in your menu. Clicking it, you are presented with a very simple menu of 5 items: Add Item, Add Folder, Delete Item/Folder, Labels, and Actions. The Actions menu includes Preferences, Print, Export, About Check Off and Quit Check Off. The Preferences allows you to control how Check Off behaves and appears; set your global hot key (which can be a combination of whatever keys you want); set your fonts, transparency and row height; personalize your labels; and set whether your want your ToDo list to be synced to your iPod notes (generation 3 and newer iPod required).

Adding/Deleting a new folder or item is very easy by simply clicking the menu icons.

Check Off is divided into two main sections: the ToDo item list and a freestyle notes area at the bottom where you can place whatever notes you want with each folder and item. Check Off allows you to resize the notes area, including resizing it to nothing so it's out of your way if you don't use notes.

The only thing I would like to change is to be able to use the return key to create a new ToDo item automatically. As it is now, you must click the menu icon each time you want to add a ToDo item. When you add one and press the return key, it ends the editing of that ToDo item and selects it. To add another ToDo item, you have to click the menu icon again. But this is so minor that I didn't penalize the Features rating.

I've tried many ToDo types of apps, both widgets and regular apps, and nothing has compared to this one. Check Off is the fastest, easiest, and most available ToDo app I've run across. And the fact that it's free makes it that much better.