ToDo List for Google Calendar

I have been using the ToDo gadget for Google Desktop to keep track of my ToDo list. But, somehow the Google Desktop nowadays uses a lot of CPU in my environment (probably after the recent update, I'm not sure). So, sometimes, I need to disable the Google Desktop. Then, of course, I cannot access to my ToDo list.

I searched a bit and found this (Google Operating System: ToDo List for Google Calendar) and decided to give it a try.