SimpleTask is a very simple application that allows you to create to-do lists in seconds. The tasks are simply created one by one, and you can add a title and short description, and you can also label tasks with a distinctive color. The tasks can be also categorized as important or not, and once you complete them you can simply check them and they will appear in the "Complete" tab. Important tasks will show a red flag.
The program allows you to search your tasks by simply entering a keyword in the "Search dialogue" located on the upper part of the program. The program is also available for iPhone as a shareware and if you get it, you also will be able to sync the tasks with your phone. Moreover, the tasks can be printed and you can also export them as a .CSV file. Unfortunately, you won't be able to label your tasks by categories or add subtasks, which is really a shame, and you cannot add reminders or alarms as well.
In short, if you are looking for a simple task creator, SimpleTask may work for you.