Yep, Listacular is still what I use on the go (it's iPhone only...) where I rarely edit my lists. It turns TaskPapers plain text into a touch interface. Featurewise, you can drag tasks, add new items, focus on tags - that's about it. The one "power user" feature it offers is to add due tags (which are not displayed as tags) and notify the user of due tasks. It also offers a URL scheme. It feels quite lightweight and is easy to use, although I'd like to have better filtering and buttons to quickly toggle tags.
In other words, I'd love to see a new TaskPaper on iOS which focuses on a great touch experience and notifications, on doing tasks more than on managing them.
(There are also too (identical) apps by Lau Brothers which also support taskpaper files and focus on touch. I don't find them usable, but they too have that lightweight feel.)