Do It (formerly ToDo) is a small application to manage categorized to do lists. Each to do item can be linked with a file on your computer, a URL, such as the address of a website, or a contact from your address book. The linked item can be opened directly from the ToDo window. ToDo items can also include notes, priorities and deadlines, which can be set as reminders in iCal. ToDo is applescriptable, includes plugins for Address book to quickly set contact reminders and a plugin for Quicksilver to allow rapid creation of ToDo items from the Quicksilver interface. You can sync your ToDo lists on multiple computers using .Mac.