It would be great if there is a possibility to maintain a todo list per user with ease to add items to it. I would like to have a button on each page such that when you press it, you have a possibility to enter a comment and save it together with the page name to some list. For instance, sometimes I see an issue in an article or a template but I don't have time to fix it at the moment, so I would like to add to the TODO list so that I do not forget to return to it later.
Right now I'm keeping a page in my user space for such purposes but it is not really convenient: http://uk.wikipedia.org/wiki/Користувач:DixonD/Todo
I believe that such an option would improve the work of Wikipedia editors.