remember the milk was one of the pioneers of online task management I assume. the web front end allows keyboard shortcuts, uses client side computing and so on, very innovative, 5 years ago... since then very few updates and innovations.
they maintain the website and apps for many kinds of devices.
also there is a forum for users where you can post ideas, which wont make any difference since nobody cares. I am disappointed.
currently I still have a abo but strongly consider to change to (twice expensive) nozbe
Knickedom about Remember The Milk: To-Do List, v3.0.3