Welcome to Tasks, Project Manager!
In project management a "Task" is something that needs to be done within a defined time. Lets say you have a programming module that needs to be finished by tomorrow at noon - that is a task. Often time you hear about tasks within a project management software. These software suites are designed to help you manage your projects with more control and awareness of everyone else involved in the project.
There are a ton of good Project Management Softwares out there as well as simple Tasks Lists. Lets have a quick look at some of them.
Basecamp HQ - This is by far my favorite of the lot right now. Designed by 37 Signals, Basecamp HQ Project Management / Collaborative software takes things beyond just task lists and does so in a very keep it simple stupid fashion.
Alex King's Tasks is a simple yet powerful tool that will allow you to manage your todo task lists online . . . which gives you complete accessiblity to all of your tasks from anywhere with an internet connection. Another great feature of Tasks is the ability to manage your todo's from your mobile device.