Google Tasks graduated from Gmail Labs back in July, but it's still adding the occasional feature to tighten its integration with Gmail. Today, for example, Tasks added a small but useful feature allowing you to quickly and easily email a task list.
When you want to share any list, go to the Actions menu and click Email task list (simple enough). Gmail will compose a new email containing your list title and the items in your list, included crossed off items if they're there. It truly is a small feature, but if you sandbox all your todos inside Tasks and then need to send them off to someone for, you know, doing, it's a really nice feature to have.
Email a task list [Official Gmail Blog]