If you are looking for an online service to track your to-do list and perform other task management, um, tasks, look no further than Remember the Milk. Yeah, the name is kinda dumb. But the service is awesome, way better than anything else you'll find out there, and that includes paid task management service.

You can manage tasks from anywhere (your phone, computer, PDA, etc), get reminders any way you like (email, SMS, IM, etc) and share tasks with people of your choosing. If you use Google service, it integrates with Google calendar, iGoogle, and GMail.

This really is a great way to manage tasks. It so easy to use that once you get started you'll wonder how you ever lived without it.