When Gmail Labs added a Task list to Gmail in December, it turned out to be an extremely popular feature. Now the Tasks app is going mobile, and is available on Android mobile phones and iPhones ...

You can add multiple tags to a single task, which then show up in multiple lists at once. And you can create smart lists, which show reminders from multiple tags. Here’s how it all works.

Google Tasks, integrated into Gmail, provides a simple way to create ordered task lists, complete with due dates, and even turn emails into action items.