I'm not going to evaluate the service itself - just note that it's the best to-do list service I've found. Instead, this is the handiest way to access it. The first time I had my email up and pulled up the add-on, I was sold. It's much more handy than switching between windows. I especially like that it doesn't take up much screen real estate, allowing me to see the page I have open and the to-do list at the same time.