This is definitely mystery.
I was searching in actual main.pp, mainbar.pas and mainbase.pas and there is not a one line about ToDo menu item.
When I looked at old svn backup (from November 2009) there is in mainbase.pas:
CreateMenuItem(ParentMI,itmViewToDoList,'itmViewToDoList',lisMenuViewTodoList, 'menu_view_todo');
I also have not item in Edit Menu: Insert Text -> General -> Insert Todo
It is Lazarus reconstruction or is my current SVN broken?
I am on Linux 64b + Qt, 29541, fpc 2.5.1
Thanks