There is no shortage of free and simple to-do list services available on the web. One problem with many of them is that you have to open a new window or a new application to use them. To Do List from the Chrome Web Store is an exception to that pattern. To Do List operates within whatever Chrome browser window you have open. Once you have To Do List installed (it takes just seconds to install) just click on its icon in your browser toolbar to open it and start adding or deleting items from your to-do list.