My favorite to do manager Remember The Milk now has a Gmail gadget which allows you to manage your tasks in Gmail.
- Review your upcoming tasks for the week
- Add new tasks and edit existing ones
- Easily complete and postpone tasks
- Review your overdue tasks
- Optionally show tasks with no due date
- Display tasks from a particular list or Smart List
- With the “quick add” feature, you can easily add tasks and optionally include a due date and/or tag