The latest version is available from https://github.com/davidoc/taskpaper.vim
From the TaskPaper website (http://hogbaysoftware.com/projects/taskpaper):
"TaskPaper is a simple to-do list application that helps you stay organized. Unlike competing applications, TaskPaper is based on plain text files which offer you paper-like simplicity and ease of use."
TaskPaper is a to-do list application for Mac OS X based on the "Getting Things Done" approach of David Allen (http://www.davidco.com/). It supports the GTD notions of projects, tasks and contexts.
This package contains a syntax file and a file-type plugin for the simple format used by the TaskPaper application. It is intended for Mac users who want to edit their TaskPaper lists in Vim from time to time (for example, in a SSH session, or on a non-Mac system) and for anyone who is looking for a simple to-do list format.