For years now, the gaping hole in Google’s online suite of applications has been a to-do list manager, but not anymore: today Gmail Labs adds a lightweight Tasks module to your email account. The killer feature? You can add a Gmail message to your task list in one click or keystroke. To get started, enable Tasks in the Gmail Labs section of your Settings area, and a Tasks link will appear below your Contacts link. Click on that to make a Task list appear on the bottom right of your screen (like chat), and there you can create multiple lists and switch between them, indent items, mark them as complete, drag and drop to reorder items, and view or clear completed items. To turn an email into a task, from the More Actions drop-down, choose “Add to Tasks.” There are also copious keyboard shortcuts.

From LifeHacker.