Taskpaper Web
http://hogbaysoftware.com/products/taskpaper_web
"A web implementation of TaskPaper. Primarily designed as a lightweight viewer for documents you have created in TaskPaper. It also provides rudimentary editing facilities for quick edits on the move."
Taskpaper Vim
http://hogbaysoftware.com/products/taskpaper_vim
"This package contains a Vim syntax file and file-type plugin for the simple format used by TaskPaper"