Not sure if I'm the only one that's noticed this, but I find myself using the "tasks" feature in google calender as a "to do" list. The fact that it is embedded within the calender is great, but it actually goes beyond that. Although gmail allows you to view your upcoming "events" from your calender, it doesn't show you your "tasks". So it seems obvious to me that gmail should embed the tasklist alongside your inbox. In this regard, your email, calender, and to do list are essentially three different things.