Gmail has many cool features and adding more and more. Today Gmail team has announced addition of new export feature which allows you to email your task list.
Like most Tasks features, "Email task list" can be found in the Actions menu.
Clicking on it will open a new compose window with the contents of your current task list. This works in all views (my order, sort by date, completed), so to email your mom to explain why you've been so busy and haven't been able to return her calls, just choose "View completed tasks" from the Actions menu, then "Email task list" and send away.
(Note: this may not be very convincing if you haven't actually checked anything off your list recently.)