GitHub has introduced a new feature that allows users to reorder checklist items effortlessly through a drag-and-drop interface, enhancing the organization of task lists without needing to edit the original Markdown text. By creating a task list with "- [ ]" at the beginning of a line, users can easily rearrange items by hovering over the checkbox and dragging the item to a new position. This improvement simplifies the process of organizing tasks and is documented further in GitHub's resources, with the feature being highlighted by Ayman Nadeem.