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Taken from the official Google blog:

A couple months ago, Tasks launched in Gmail Labs. Tasks lets you easily create and manage to-do lists right in Gmail. Now, you can access and manage your task lists from your phone, too. Just go to <span style="font-weight: bold;">gmail.com/tasks</span> in your mobile browser and log in. If you have a Google Apps account, you can go to <span style="font-weight: bold;">mail.google.com/tasks/a/your-domain</span>, replacing your-domain with your actual domain name.

On most phones, you can view tasks, add tasks, and mark them as completed. The changes are automatically reflected in Gmail. If you have an iPhone or an Android-powered device, you can also add, edit, and delete entire lists as well.
<a href="http://www.dailymobile.net/2009/02/04/google-tasks-now-available-for-your-phone/">

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