If you are used to advanced task tracking systems with projects, tags, subtasks, detailed notes etc. (org-mode or even a full-fledged project management system such as Trello) and not satisfied with the simplicity of a system like ToDo.txt, there is a @TiddlyWiki plugin for Task Management. http://tiddlytables.tiddlyspot.com/
It conveniently appears in the side bar, so that you don't have to figure out how to "pin" a tiddler.