Vitalist and GTD

Vitalist is perfect for anyone needing to get things done.
Easily organize your actions and projects online.
From grocery lists to business projects, track it all with Vitalist.

FREE!
Anyone can sign-up for a free Vitalist account and start their online GTD experience.
Our free accounts have no limitations on the number of actions you can create.
Extra features such as additional projects, sharing, file attachments, and ssl secure data transmission, are included with our Basic and Premium versions for only $5 and $10 per month respectively.

Step 1: Getting Started with Vitalist and GTD.
Start out by putting anything you may need to do or remember in your Vitalist inbox. This can include to-dos, notes, projects, ideas, phone numbers, etc. The idea is to get it out of your head and into Vitalist.

Step 2: Getting Organized with Vitalist and GTD.
After you have added actions to your inbox, you need to process them and get them organized. Each action can be moved to its appropriate list. These lists include:
Actions: Things you are ready to get done
Waiting: Things you are waiting for other people to do
Someday: Items you want to think about in the future but are unsure when
Ticklers: Items you would like to be reminded about on a specific day in the futureReference: Un-actionable items that you would like to remember
Once the appropriate lists have been chosen, you can add attributes to each action or item like projects, contexts, due dates, and priority.
You can also set up actions with reminders and to repeat at specific intervals.

Step 3: Getting Things Done (GTD)!
Now that you have organized what you need to do, it is time to start getting things done.
Vitalist gives you the power to access your lists and actions from anywhere. Mark your items complete as you go. All actions are archived so you can easily review how much you got done.

GETTING STARTED

It is quick and easy to get started with Vitalist and GTD. Just sign-up with your valid email address and name, and you can be up and running on Vitalist in seconds. All users are given free accounts to start, but you can upgrade for more horsepower at any time.

GETTING THINGS DONE (GTD)
Vitalist makes use of David Allen's GTD methodology.
In an effort to bring GTD online, they created Vitalist.
It implements every step of David Allen's methodology so you don't have to keep track of it yourself. No more painstaking updates of documents, spreadsheets, or paper to-do-lists. With Vitalist, your lists are online, in GTD format, and ready to be accessed or updated from anywhere.

VERDICT
The interface is clean, listing Inbox,
Projects, Actions, Waiting, Someday, and Reference tabs. Making heavy use of Ajax, the system moves pretty smoothly between capture (inbox), sorting (projects) and doing (actions).
I think it's a great tool to keep an eye on your projects and your to do's.
It integrates fine with my iCal application (MAC)
Vitalist is a simple to use and powerful list manager, and has become my tool of choice for my list management.