What are some alternatives?
When comparing Task Coach and jdotxt, you can also consider the following products
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
Remember The Milk - Remember The Milk is a task and time management application for mobile devices.
Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.
Google Tasks - to-do list app that integrates with Gmail and Google Calendar
Amazing Marvin - Customizable task manager and day planner
Toodledo - Toodledo provides a set of tools to increase the productivity.