Remember The Milk is an excellent to-do list manager. Its clean blue and white design is stunning in its simplicity. RTM is speedy; I hardly ever need to reload the page thanks to their advanced use of AJAX. RTM is replete with shortcuts for incredibly fast adding and editing of tasks. RTM is no simplistic Ta-Da list clone. With RTM I can not only assign due dates, repeating tasks, tags, locations and notes, but I can also get notified via Jabber, GTalk, AIM, SMS or email of my pending items. Best of all, RTM is free of charge and well-supported.